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I've got a few I use right now with my Nexus S.
For tracking information while driving, I use Torque ($5). It's not free, but it provides a lot of features, including logging of chosen variables, the ability to use add-ons (though not many exist at this time), and a lot of customization in the display. It's still being actively developed to include new features, fix bugs, and be more compatible with more vehicles. Works fine with the XR7 Bluetooth OBD-II tool I've used in the family Echo and Town and Country. For maintenance it also reads (all) and explains (most) trouble codes, in addition to recording Snapshot information and resetting the ECU trouble code indicator. There is a free version, but it is REALLY out of date compared to the full version, and really only exists to ensure everything is communicating properly (though, being so out of date, it will throw lots of false negatives).
I also use Car Maintenance Reminder Pro ($2). I'd use the light version, but I got the Pro version for free in the Amazon Appstore. In addition to tracking all sorts of fun statistics and generating graphs, it also reminds you about maintenance you should be performing on your car, with the option to change the maintenance intervals (say, bump oil changes to 3,500 miles instead of 3,000) and include custom reminders (like change your A/C Coolant every... actually, I have no clue how often this should be done, but it's just an example). The free version is basically the same, but with some artificial ceilings on the number of vehicles you can track and backing up data.
I also use Gas Buddy. It's very nifty tool, and it's dramatically improved over when I first started using it (it used to be ungodly slow). It's still kind of wonky. Nice thing is that they have a Mobile Web UI, so people who are running devices that don't have a dedicated app can still use the service (such as the BlackBerry). The Web version has all the same features, including locating you with GPS (if your browser supports it).
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