I'm an enormous fan of Mint. Most of my bills come due within the first week of the month (minus the electric, which is bi-weekly); anything that wouldn't fit that schedule is actually taken care of by my housemate and then we settle up later. Mint reminds me 7 days before my bill is due, and so on the 1st of the month I sit down and pay everything right there. (Then my account balance cries for a while.)