Panasonic Store:
Right, the G10 and G15 are pretty much very alike apart from a few differences:
The screen is exactly the same, so picture is no different, thought id mention this before i go ahead and explain the difference between the models
Now, mainly the G15 has better speakers built in, also Viera Cast which gives you YouTube etc online entertainment (this is hard wired not wireless) and streaming capabilities if your pc is linked to the tv. So in a nut shelf... if you want the internet capabilities, streaming and a slight better sound system, then the G15 is the one for you but the G10 is a cracking buy as an all round performer.
I hope this helps, good luck with your choice as both are great plasma screens.
Regards> M
The G15 has an extra surround sound effect over the G10 which is not particularly convincing, other than that they both have identical sound systems.