Wolfram alpha is also fantastic for math. Mailinator is definitely the best throwaway mail account site. You can put any firstname.lastname@example.org, then without even going to the mailinator site, sign up. If you need to verify, you can go to the site.
I wonder if the snow loves the trees and fields, that it kisses them so gently? And then it covers them up snug, you know, with a white quilt; and perhaps it says, "Go to sleep, darlings, till the summer comes again." - Lewis Carroll, Alice in Wonderland & Through the Looking Glass #quotes