Garmin has just opened up developer.garmin.com, which is now their warehouse for Garmin Web APIs and toolkits. Under Device Communications you can find tools for transferring data to and from your Garmin GPS device. Under Web Services you can find APIs for interacting with MotionBased.com, using its Activity Player as your own, and transferring Garmin data from your Web site to a device. There's also stuff in there for SmartPhones/PDAs, Fleet Management, and location-enabling your Java app.

I'm most excited about the Activity Player API. As cool as the MotionBased site is, I would like to gain a little more control over my data.