Android/iPhone: RunKeeper, the exercise tracking tool that we've found to be like Nike+, only better, has hit the Android market, giving those who can run with their phone a handy, data-rich means of tracking their times, calories, distances and more.
Like its iPhone predecessor, RunKeeper for Android uses GPS to plot your runs (or walks, or bike trips) on a built-in Google Map, and keeps track of how fast you're running, the calories you're burning, and all the other fitness stats you'd expect from a full-fledged running partner. I haven't tested out RunKeeper in a real run yet, so I can't say whether this initial free version offers the audio cues ("Five minutes left") that the paid iPhone version offers. The RunKeeper team has stated, however, that they plan to continually iterate new improvements and features into this Android version.
RunKeeper is a free download for Android devices, along with iPhones. Looking for a more Google Maps/Docs-integrated fitness tool? Try the Google team's own My Tracks Android app.