Here is a mini-review I posted in another thread:
Games run great on the m680. Guild Wars runs at 50+ fps at 1680x1050.

Also tried Half Life 2 and Far Cry. Both are quite playable at 1680x1050 as well although I ended up lowering HL2 down to 1280x768. Other games I tried are Unreal Tournament 2004 (again, runs great at 1680x1050) and Tribes Vengeance. I am using the latest ATI Catalyst driver that I modded with Mobility Modder.
Far Cry @ 1680x1050Guild Wars at 1680x1050
Battery Life- I bought the 12 Cell. I am testing the battery right now doing basic tasks, wifi on, browsing the web, etc. I had 100% at 7:34 p.m. As of 10:17 p.m. I have 51% left. I am on track to get 5.5 hours. Amazing for a notebook this size.
Screen- Ultrabright WSXGA+ 1680x1050 Resolution. I can sum it up in one word- PERFECT. I had the Dell 9300 before the m680 and I can safely say that the Gateway screen blows it away. No "sparkles", white whites, and black blacks. Excellent viewing angles and no noticeable light leakage. I lucked out and have no dead pixels.
Size- Big and surprisingly thin. My 12" Dell 700m was thicker.
Heat and Noise- Cool for the most part. Idles around 41 degrees Celsius when on battery and around 49 degrees when on AC. Gets warm in the left palm rest area when on AC and especially when gaming. The memory slots are directly beneath this area so I'm sure that contributes. On battery everything stays cool. To the guy that sent his notebook back for repair because the fans would come on, I'm sorry to say you will probably get it back in the exact same state. The fans are very quiet but they do run.
Sound- Very good. No tinny sound here.

A word of advice- Format the machine as soon as you get it and do a clean install. Either that or disable the preloaded crap. The notebook was unbelievably slow out of the box. After a fresh start everything is smokin'.
I will post pics soon if anyone is interested. If you have any questions let me know.
My specs:
1.73 Ghz
1 GB PC PC4300 533 Mhz
100 GB 5400 RPM Hard Drive
8x DL Dvd Writer
ATI x700 128 MB using latest Catalyst driver
12 Cell Battery
Intel 2200BG Wifi