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BillTracker. An iPhone app that tracks bills, due dates and amounts and itemizes how much you owe in a particular month. I also use Mint.com to track spending and debt.
Mint Bills rocks! Has been a lifesaver for me! Also keeps tracks of apr, limit changes and transaction history.
I have 5 CC, for 3 of them the due date is 14th the other 2 is on the 1st of the month. I just pay all of them on the 10th of each month. I call it my bill day, I pay everything from my cell phone, health, car insurance and you guested it credit cards. You can always call your CC companys and asked them to move your due date.
Still using Quicken. Tried to convert wife to Mint, but she's too stubborn to learn a new way. Probably once Intuit starts phasing out Quicken in favor of Mint, I'll be able to convince her. Until then, Quicken does a great job for us.