Whether the professor is writing on that whiteboard or skipping through a power point faster than you can copy notes, take a quick picture with your cellphone and email it to Qipit.

Qipit, is a useful webapp that will recognize the text in your photo, from whiteboards to handwritten notes to pages in a textbook, and turn it into a searchable PDF and email it to you.

Pretty cool, huh?

Lifehacker.com has a nice tutorial here.