Metacycle is a site where people can upload ideas for repurposing old consumables – they feature (and seem to have the same logos as) the Pen-Connectors in the last post – which is a genius idea if you ask me, especially if you could thread wires through the connectors.
There have been a couple of sites like this of late – forums for “new ideas” which look suspiciously like they’re about to devolve into just-another-design-company-spam location. I think the “design challenges” bit is a great idea – kindof like “what are 20 other potential uses for a paper-clip”. The amount of information about each idea/design seems to be a bit sparse though.
It also reminds me a bit (because of the recycling angle) of that utterly brilliant Indian site which has hundreds of DIY toys/Experiments etc.