It's that time of year again -- Shark Week is about to begin. Starting on July 27th (that's tomorrow), the 21st annual Shark Week kicks off tomorrow, with a Mythbusters special on the subject airing at 9:00PM ET / PT. 24 hours later, you'll be treated to Surviving Sharks, while the next day brings Day of the Shark. Those smelling blood can hit up the read link and swim on over to the programming guide, but be prepared to sacrifice more than a few hours (or a decent chunk of storage on your HD DVR) this week to satisfy your cravings.