This is shaping up like a week of useful new web applications.
EarthNC‘s free TakItWithMe, which launches today, does one useful thing really well: Turn Google MyMaps content (or even KML) into a GPX file that can be uploaded to a GPS device. If that GPS device is a Garmin and you’re running Windows, you can upload from within the web browser after installing the Garmin Communicator plugin (Mac version coming — until then upload manually using LoadMyTracks).
The KML upload feature, in beta, is useful as a way of getting other geoweb content onto a GPS device. EarthNC’s Virgil Zetterlind writes that it works with the KML feeds output by Picasa Web, Flickr, Yahoo Pipes and Platial.
The upshot: Annotate with Google MyMaps when exploring a future adventure — then easily upload those points to your GPS device and have them handy while in the field.