Some 
for your blog or other uses, intensely cool and very simple:
- Antipixel – Blog – Steal These Buttons – some cool buttons, might have started it all!
- Taylor McKnight – –Steal These Buttons Database – a huge collection of buttons
- Button Maker — Kalsey Consulting Group – make your own, online and instantly!
- Joe Grossberg- Steal These Buttons Too – some more buttons
- W3C buttons without images – buttons in pure CSS