Sony will announce soon, officially, their "action" camera.
Here it is :
looks like it has a built in battery but apparently it has a built in stabiliser (probably of the digital type)
JVC has the CG XA1 (Adixxion), don't have any idea about this one but I never liked their image quality including from pro stuff and had plenty of problems with their CODECS
(basically hard to edit)
Some like the Contour, others the Drift, neither looked as good as the GoPro particularly once the vision was processed via their new software.
Don't expect high quality stills from this kind of cameras, just snapshots.