Mint is probably the most impressive web application on the planet right now. And with the economy getting more shaky every day, who doesn’t need to monitor their finances? I started using Mint about a year ago. At that time it was nice, but pretty basic.
Now, Mint has one of the best user experiences on the web. From a developer’s standpoint, I’m amazed at the things this app can do and just how smooth it is. The design is great as well. If you haven’t tried it yet, I highly recommend you give it a shot.