Last year, Wired Magazine published a seried of articles called "Living by the Numbers", which explored the advantages of tracking personal data to help reach goals in the areas of excercise, health, and nutrition. This got me thinking that tracking data for anything can be useful for reaching goals: keeping up with books you've read, logging food consumption, tracking the minutes spent in your daily commute, etc.
Some sites do a great job on focusing on a very narrow category (such as finance or nutrition), but I'm interested in a site that lets me track and visualize data in any category for the purpose of helping me achieve personal goals.
I've been using a web app called daytum for the past few days and have been pleased with its simplicity, but it could be better. Before I invest too much time (and potentially money) into that web app, I'm interested to find out other good web apps for tracking anything that is not too closely tied to a specific category.