This font is 100% free. Yes, you read that correctly. Feel free to use this on any commercial or non-commercial projects. I don't charge any fee for the usage of this, I'm just glad it's being used so widely.
If you do use this however, please show me the work you used it on (my e-mail's on my profile page)
Note (7th july 2011):
Wow! Over 550k downloads. This font has become more popular than I ever imagined. It's nice to have a font with such an "achievement". Thank you all for downloading. And for those who STILL keep e-mailing me about the legal use of this font - please stop. The only way you can support or "pay" me is to just download and use the font whenever and whereever you want.
Note (23rd july 2014):
Just thought I'd leave a quick note here again. I see this font pop up on blogs, YouTube videos, magazines, posters, logos, etc. I love it that people are using it but if you guys do use it, please send me an e-mail of the work you used it on. (Totally optional, I just want to see how it's being used)
Also, I updated the 'license' section slightly, so you can see loud and clear that it's 100% free.