I can't be the only one with multiple accounts...

Chase Freedom -- for the rotating 5% categories
BoA Cash Rewards for most purchases -- redeem into one of their savings accounts for additional 10% bonus (so 3.3% on gas) + it's a chip card, so I can use it for trains in Europe (but it has a 3% fee)
Chase United Visa - no FTF on purchases in Europe, but no chip
Amazon Visa -- 3% back on Amazon purchases (a lot for me)

Chase Checking -- there's a million Chase branches in the Chicago area. Makes depositing checks and taking money out easy
Fidelity Cash Management Debit - great for travelling, no foreign ATM fees.