What are some free/commercial stock icon sets?
Here is a list of all my icon links, some for free and some for pay:
Free + Paid for
Needless to say ... I like looking at icons!
I love the Silk famfamfam icons personally.
The Fugue and Diagona icons are free if you give credit, alternatively you can pay not to have to.
What about a search engine for icons? I find http://www.iconfinder.com/ very useful... it's actually more useful than having a single icon pack available.
The Pictos sets are worth every (reasonable) cent. I've used them more than any other set since I picked them up.
The Tango Icon Set is a nice addition I use a lot, next to the Famfamfam already named.
Icon Dock have have some nice icons too, but it's commercial.
These are quite expensive but are a nice family of icons:
Depending on what you need, a good source for icons is iStockPhoto. Search for "icon set" and you'll come up with nearly 30,000 results and many of them are very very inexpensive considering the quality you are getting (and most are vector based).
I'm a big fan of the icons from GlyFx.
They have some free packs (see http://www.glyfx.com/products/free.html) if you working with a small (or non-existent) budget.
Some time ago my work licensed one of their multipacks, giving us a wide library of graphics that we use across all our projects. Consistent quality and styling - recommended.
Tabsicon.com are getting regular updates, and is available in both color, and a simple glyph version. Great for crossplatform use.