I successfully opened a Wells Fargo Business Checking account today. The sign up bonus is $825 for $25k invested for a little over 30 days. I signed up for yesterday online and it went pending. Details of the play available at Profitable Content.
Once the account is opened, one has 30 days to deposit the $25k, then hold until the 60th day of account opening. Assuming a total investment period of 40 days — 30 days plus a 10 day buffer — this turns out to effectively be about 35% APY play: