Mint

Mint.com is a personal finance website that allows you to set budgets and track spending on a daily basis. One of the reasons I like Mint is that it categorizes all of my spending into categories like: Groceries, Gas & Fuel, Bills & Utilities, Home Improvements, Heath & Fitness, Restaurants, and many more. You can break down categories into more specific categories such as, Home Improvements > 2012 Bathroom Remodel, to really keep track of where your money goes. 

After first hearing about Mint.com, it took me one year to get past the fact that you give Mint.com your online banking logins. Mint is trusted by all the bigger banks and takes pride in their security, otherwise they would be out of business... Read more about their security here.