Mint.com is relatively new (since 2006), yet amazingly popular.
As I see it the main benefits of Mint.com are:
Transactions - All your transactions across all your accounts (almost; some banks aren't supported). This includes things like your checking, savings, CDs, credit cards, loans, and retirement accounts. It's nice to be able to see them all together and categorize them appropriately.
Graphs - Being able to easily make visual representations of your spending or the trends of your retirement account is nice.
Notifications - Mint can notify you about certain important financial moments. For example, they can notify you
- if your spending seems anomalous (this takes a few months to adjust),
- when a large purchase clears, or
- when you are near your credit limit.
Small Banks - Even though many institutions are supported, some smaller (e.g., local banks) are not, and there's no way to manually import your data. (Although, they say it's coming "mid-march.")
On balance, Mint helps people who are interested in their spending habits get a larger picture of their income & expenses.
Mint.com at Wikipedia for some other information.
Want Everyone To See Your Credit Card Transactions? at TechCrunch for a discussion about Blippy—a twitter-like site that tells everyone what you're buying.
- Mint now allows the creation of manual transactions.
- See Why Wesabe Lost to Mint by Marc Hedlund for an introspective article on how Mint surpassed Wesabe, a former competitor.
- Forgot to mention that mint supports lots of banks now; even small ones.