Neat, straightforward idea management.
<a href="http://www.kindlingapp.com/" rel="nofollow">http://www.kindlingapp.com/</a><p>Iphone feature, bit more commercial.
<a href="http://www.ideascale.com/" rel="nofollow">http://www.ideascale.com/</a><p>And of course probably the best option:
<a href="http://www.evernote.com/" rel="nofollow">http://www.evernote.com/</a>