In addition to these two, the popular Silk icons set should not be forgotten: http://www.famfamfam.com/archive/silk-icons-thats-your-lot/ http://www.famfamfam.

In addition to these two, the popular Silk icons set should not be forgotten: http://www.famfamfam.com/archive/silk-icons-thats-your-lot/ 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.