WHY IT MATTERS: Gold star to Grockit as the one edtech company on a list of 80 "hot" SF companies, picked by market research firm, Lead411, after surveying 2,600. The companies had to have either doubled revenues or received $5 million funding over the past two years. (Grockit scored $7 million in investments last year.) As one potential edtech investor told us last week: "This field needs some big exits." But before exits come recognition. So thanks Grockit for notching up the reputation of the space a bit more. (Think you should be on the list? Apply here.)