i agree with emmett. mint is great. it lets you pull in data from multiple bank accounts and track your spending patterns across all of them. and in a cleaner, simpler interface than competitors like geezeo, or wesabe, imho.
as to the whole security issue -- is anyone scared about making online purchases these days, like they used to be a few years ago? mint is as trustworthy as anyone else in the online finances business: http://mint.com/safe.html