My new favorite website
Since learning that I'll be a father, I have begun taking my finances seriously. Mint is one of many sites that collects all your online accessible bank, charge, and loan accounts into one place. It then creates charts and graphs so you can learn quickly how you are spending and how your savings accounts are working.
They have just come out of Beta and have now added brokerage, mutual funds and 401K accounts. I highly recommend it.