If you appreciate the need for budgeting and tracking your spending but you find typical financial software too tedious, give The Birdy a try. This webapp makes recording your spending really easy by asking you to reply to its daily emails.
Each day, The Birdy will send you an email asking what you bought that day. Reply with one purchase per line, including a description and tags like this: "$10 lunch #food #work" then The Birdy will record it in your account. That's it!
You can also add purchases via the website.
It's a great app if you're prone to forgetting to track your purchases, use mostly cash to buy things, and/or don't want to use services like Mint that connect to your accounts.