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In addition to these two, the popular Silk icons set should not be forgotten:

http://www.famfamfam.com/archive/silk-icons-thats-your-lot/

It seems like all these icon sets are somewhat compatible, they have a similar style. I wouldn't be afraid to mix and match icons from these sets together, so that makes a pretty large collection of icons to use.

Here's another one of my favorites:

http://glyphish.com/ Glyphish - 200 icons for mobile apps, CCA

It's also worth noting here that you can pay $25 to get the set of 200 and another set of 80 in both bitmap and vector formats without the CCA license.

You can find both Fugue and Fatcow icons + many more here: http://www.iconfinder.com/browse/alphabetic

Wow I've been using the famfamfam Silk collection forever now but these are a welcome alternative.

Thanks for the link.