I just bought a Galaxy Nexus, now I got a problem, my ADB doesn't recognize it. The Point is when I connect it, it shows it as Storage-Device on my Computer but it isn't listed as an ADB Device.
When I connect my other Phone (HTC Desire HD) it recognize it without any problems.
Some information about the System and Config:
Check if you have installed this package in your ADB "Google USB Driver package, revision 4"; if not do it.
Another possible solution could be downloading the drivers from here: http://www.samsung.com/us/support/owners/product/SCH-I515MSAVZW
This appears to work for the Samsung GT-i9250 version too.