The OWS folks are pushing to get folks to pass their bucks into banks and credit unions that don't apply monthly fees to their accounts and debit cards (BoA being the most notorious present example). It so happens that there's movement in this direction from hard right circles as well. Just this morning before worship several folks were talking of moving their accounts out of BoA and Wells Fargo for similar reasons.
Now, of course I'm not against the right of any bank to make any contract with its customers that they agree to willingly. However, I'm also strongly in favor of the right of their customers to tell them where they can go with their new fees and what they can do when they get there.
Also, the major banks, with the possible exception of BB&T, are our cultural enemies. They provide vast amounts of money and prestige to the various foundations that are anathema to us. So anything that hurts them is favored. The time to boycott is when a target is already weakened and under assault from other sources as well.