This is the S1, the entry-level model, slotted below the premium G10 and ultra-premium V10 models.
These are the things the G10 has that the S1 doesn't:
BTW, this list was copied from Randy Walters at AVS Forum
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Five Color Temp choices: Cool 2/Cool 1/Normal/Warm 1/Warm 2 (S1 only has the usual 3: Cool/Normal/Warm)
THX mode
48Hz mode
Sub Pixel Control
Viera Cast IPTV
Analog Audio Output
Can play AVCHD/MPEG2 video from the SD card slot
Bass Boost: Enhances bass sound and provides powerful sound. (On/Off)
x.v.Color: Provides the appropriate picture when images corresponding to ?x.v.Color? are input via the HDMI input of this TV. (Off/Auto)
LAN Port
VGA port
Nicer Pedestal Stand
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A few more calibration options, better connectivity options, and some modes that are apparently awful anyway (48 Hz and THX). It's actually the same panel in the two TVs. Viera Cast may be important for some people. To me, none of these features warrants the few extra hundred $ for the G10, but the V10 is a big step up from either (96Hz playback of 24 fps content, flush bezel, etc).