Mint.com Personal Finance Everyone's favorite finance app, Mint.com aggregates all of your accounts, syncs with them, and keeps an updated record of where you stand between checking, savings, etc., at any given moment. Really useful for keeping organized!

PayPal I manage a lot of transactions this way whether it's online shopping or invoicing my freelance clients - great way to invoice and send money at anytime.

Chase Mobile I actually haven't used this one myself because I don't use Chase for banking, but those I know do have sworn by it's simplicity for managing accounts.