"M" Logo Loop?!

[JasonPurp]

So I just tried to install a font on the bus ride home. It said install failed. So I was on Facebook and went back to my home screen, and there wasn't a font for anything. I figured "Alright, maybe it DID work, I'll just reboot."

However, now my Droid is stuck at the "M" logo while booting, and I need my phone back within an hour, MAXIMUM. Can I please get some help? I remember a thread about this, but I can't find it now. Thank you. Please help.