Today I am thankful for email. I know this isn't very exciting or sexy. However, I vividly remember the days prior to e-mail. The days when you would write a letter or memo by hand or typewriter. You would then place a stamp on it or send it via inter-office mail and wait days or weeks for a reply.
Today if I have a problem or just a question, I can send off a note to someone within seconds. Of course this can be good or bad, ask anyone who hasn't thought something through or proof read before hitting the send button. But overall e-mail has made life a little easier.