An Ode to Wiki
I honestly have to say Wikipedia is the hottest thing since sliced bread (and I'm an expert on sliced bread lol!). Its so easy to use and very convient. Most of the time it beats the hell out of looking through textbooks. For example, today I realized I don't know how to do the integral curve for proton NMR (not as involved as it sounds), so I found it there. Wiki also helped me study for my Cell Bio exam (our textbook is a disaster though). Come to think of it, I used it quite a bit last semester when I was writing my paper of the sudden collapse of the wave function. So yeah, Wiki rocks!