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.