Ask HN: What do you use for tracking misc data?

So, we all know exercise is important for us hackers who sit around all day. In fact, I've been told by two doctors now that I need to get in better shape or I'll have serious back problems in 10 years. In addition to buying a bike and taking taekwondo, I've started doing pushups and situps every evening. In order to provide a sort of incentive, I'm tracking how many I do every day in a calendar in iCal. This got my data nerdity all fired up. Now that I have a month or so of data, I want graphs and stats and stuff. Before I spend an afternoon indulging in attacking the ics feed with some regular expressions, I was wondering if anyone else has had a similar problem. Let's say you have 2 or 3 variables to track on a daily/weekly basis. What's the best tool for the job? Should I stop using iCal for this? (The nice thing about the ics format is that it's easy to also record the time the event occurred, so I can in theory get hour and day-of-week data.)