Attempt to Summarise (wiki)
The options seem to be:
1 Keep them for posterity
See John Cavan's answer.
Personally, this is my favourite, because objects we think of as junk to be thrown away are really part of history. I put this into practice often. (My wife does not see things from quite such an historical perspective, however ;)
2 Give them to people who will use them
See John Cavan's answer.
This is probably the most constructive and generous idea so far. It's definitely the one to follow if you haven't got the space to keep them for posterity, you don't need to sell them for cash and you don't have a project to use them in.
3 Sell them on eBay
See asalamon74's answer.
This is a variant of 2, but with a little bonus for you. :)
4 Salvage what you can from them for other projects
Evan Krall's answer provides an example. I'm sure there must be other projects like this, but I can't come up with them. This wouldn't be my choice, because I am a complete klutz, and totally incapable of projects like this! ;)
5 Keep using them
As @lindes suggests, get some film and keep on using them. Enjoy the deep colours, high resolution and all-round analogue awesomeness of the chemical camera!