I use Mint for on-the-go tracking, but I also have a spreadsheet system where I track not only spending, but budget, income, savings rate, and a bunch of financial goals. (I've got so many tabs in that sheet at this point.) I highly rec Google docs -- since manual tracking doesn't require account access, it's more secure, and it also allows you to have your data available on the go if you want to do tracking as you spend.