Just had a clear up of some ideas as well.

The best from my 3 years of sweat and tears, and worn out finger-tips? I like the self bouncing ball, village clock and the waffle meter, all of which I would like to see working in real (non-hb) life.

Other ideas that I have liked, for some reason or another, in no particular order:

Fresh water hand pump, by [Worldgineer]
http://www.halfbakery.com/idea/Fresh_20Water_20Hand_20Pump

Coffee cup watermark, by [AO]
http://www.halfbakery.com/idea/Coffee_20Cup_20Watermark

Wordy watch, by [phundug]
http://www.halfbakery.com/idea/Wordy_20Watch

Knowing when it's half full or empty, by [FarmerJohn]
http://www.halfbakery.com/idea/Knowing_20when_20it_92s_20half_20full_20or_20empty

We apologise for the inconvenience..., by [froglet]
http://www.halfbakery.com/idea/We_20apologise_20for_20the_20inconvenience_2e_2e_2e

Reverse RFID tag, by [hippo]
http://www.halfbakery.com/idea/Reverse_20RFID_20tag

Ring Clock, by [fridge duck]
http://www.halfbakery.com/idea/Ring_20Clock

Cheap Shot Recreation, by [half]
http://www.halfbakery.com/idea/Cheap_20Shot_20Recreation

Photospotting, by [Detly]
http://www.halfbakery.com/idea/Photospotting

Beer Miles, by [Checkers]
http://www.halfbakery.com/idea/Beer_20Miles

A Push-Brite Wall, by [Zuzu]
http://www.halfbakery.com/idea/A_20Push-Brite_20Wall

Strobeverts, by [gtoal]
http://www.halfbakery.com/idea/Strobeverts

Raster pen, by [gtoal] again
http://www.halfbakery.com/idea/Raster_20pen

Mirrored Mosaic Madness, by [lostdog]
http://www.halfbakery.com/idea/Mirrored_20Mosaic_20Madness (brilliant, I think!)

inflaTUBE, by [arvin]
http://www.halfbakery.com/idea/inflaTUBE

Oh, and I almost forgot Water Maze, by Simonj (sorry!)
http://www.halfbakery.com/idea/Watermaze

I apologise if there are some that you think ought to be here, and are not.

Dave.

[Oct 04 2004, last modified Nov 04 2007]

3D shots using fairly normal SLR camera (+2)
800hp clock (+6, -3)
A car for my wife (+8, -2)
A day of opera (+3)
A talking head (+2)
Air Hockey Slide (+4)
Air tube extending stilts (+11)
Alternative rolling robot moon explorer (+5, -1)
Ant trails (+1)
ATM handshake 2 (+15, -1)
Audio printing (+3)
Backwards hair-style (+3)
Barbie Gallows Adventure Set (+8, -1)
Beer spy glass (+5)
Bends in the Benz? (+5, -4)
Better swype keyboard (0)
Bicycle blower (+1)
Blimplane (+4)
Body part removal (+1, -10)
Breathing hand dryer (+13, -1)
Car jack brake (+35, -3)
Car jiggler (+7)
Car stereo type (+6, -3)
Confounding Confetti (+7)
Conveyor trials (+4, -1)
Corner of your eye (0)
Crowd gatherer (+2, -1)
Dayglo dogs (+3)
dc electric fence (+1)
Devilment door (+30)
Dirty display (+10)
Drowning alarm (+2)
ELWB motorbike (+2)
Empty whiteboard marker (+1)
Enhanced gyroscopic force generator (0)
Escaping the big crunch (+5, -10)
External sounds on the car speakers (+10)
Fake Cell Phone and arm (+5, -4)
Fiber optic collimated headlights (+2, -1)
Fiendish Faucet (+7)
Flat tyre indication (+3)
Fluidised bed swimming (+2)
Flywheel speed increase (0)
Galactic Positioning System (+2)
Get the Icon! (+14, -1)
hair-ice (+2, -1)
Hallowasn't (+2)
Happy Fun Ball (+6)
Heat-shrink hair-band (+2)
Helium injection for speed (+1)
Hole punch 'staple' (+4, -1)
Hot shave (+6, -1)
HTML link delay (+9)
Huge rolling wheel (+6)
Hydrogen from solar furnace (+2, -2)
Immortality on the net (+2, -1)
Imps and Voults (+3, -1)
Increase solar furnace max temperature (+1)
Inductive escapement (+5, -1)
Intensive tree burning for country (+4)
Invisible raft (0)
ISON fire (0)
JCB controls (+3)
Jogging energy saver (0)
Kindergarten maze (+12)
Kite pump (+5)
Laser road art (+3)
Laser shockwave accelerator (+1)
Let's use the Halfbakery to test some PhD thesis artificial conversation software (+3, -7)
Light up the light switch (+12, -1)
Ling's Leg-up (+8)
Lithographic Tasseography (+3)
London Eye offices (+17)
Lowrider bike (+7, -1)
Magnetocaloric supercooler at home (+5, -1)
Magnetosensitivity in humans (+6)
Make a pigeon B-Sick (+3)
Meeting cost (+2)
Megapixel multiplier (+6, -2)
Memory stick advertising (+10, -3)
Mini segway executive chair (+1)
Moon ring (+8)
Morphing heads (+2)
Mosaic removal (+2)
motorcycle built for two #2 (+2, -1)
National no national day (+1, -4)
NEO spin-up (+5)
Nitrogen powered bicycle (+4, -1)
Noisy lamp (0)
Nut pump (+6)
Optical mouse (+5)
Orange Juice in an Orange (+31, -1)
Pen-Eeeeeeeeee... (+7)
Photochromic whiteboard (0)
Photocopier cleaner (+1)
Piezo fly (+1)
pinhole microscope (+1)
Pneumanic transport (+4, -3)
Pogostick hovercraft (+3)
Pop up shrubbery (+3)
Portable solar concentrator with high concentration (+4, -4)
PSU/UPS combo (+3, -1)
QR face (+3, -1)
Reasonably Warm Fusion (+2)
Reduced emission vehicle (+1, -3)
Reinventing the egg timer (+17)
Retro space-walkman (+1)
Roll your own bubble wrap (+6)
Rotating camera (+2)
Satellite lottery (0)
Scale rule marker (+1)
Segway grass roller (+5)
Self bouncing ball (+16, -1)
Shortcut for Excel lock reference (+1)
Silk based muscle fibres (+2)
Singing golf ball (+5)
Sleep mark pillow (+4)
Smart phone body control (+2)
Smoke ring exhaust (+20, -1)
Snake roller (+7)
soft switches (0)
Sonic screwdriver No.2 (+1)
Souvenirs in space (+1)
Spin based binary (0)
Spinning egg test (+3)
Spoke a man (+1, -1)
Spolling disk contest (+1)
Spring Steel hook and loop fastener (+4)
Spy drone with no fuel (+1, -10)
Staple empty indicator (+10)
Strobed Alloys (+1)
Stroking room (0)
Table legs (+5, -1)
Taxi flag (+5)
Telephone cable theft detection (+1)
Tesla streetlighting (+18, -2)
Test spares inventory for cars (+2)
The best brain ever (+3, -5)
The biggest croissant (+9)
This desk sucks accessory (+2, -1)
Throttle control (0)
Tight-arse wallet (+12)
Tiled snakes and ladders (+4)
Tissue blowing (+6)
Toast Man (+3)
Toilet that never needs cleaning (+2)
Toroidal bubbles (+9, -1)
Tube conveyor (+10, -3)
Tubot (+9, -2)
Twin dish (+3)
Two threads (+5, -1)
Unergonomic engineering (+6, -1)
Vacuum fishing (+1, -2)
Vacuum superconductor transport (-1)
Vacuum triggered food expiry (+5)
Vertical thrust braking (+19, -3)
very fast spinning rotor (+5, -2)
Village clock (+3)
Vortex ring fan (+13)
Waffle meter (+19)
Wave powered vessel propulsion (+1)
Window display (+4)
Windscreen scrubber (+1)
Wireless doorbell (+10, -3)

random, halfbakery