These things don't have dedicated graphics cards, so you're pretty limited.
Games that I find run very well:
Defcon (great RTS)
Battlezone 1& 2 (excellent, and even after 10 years it looks GREAT)
Blade Runner (lot of fun, nice atmosphere like the movie, but easy)
Comanche vs Hokum-- modded
Apache vs Havoc
Heavy Gear
Age of Empires
Dune 2000
...almost handles X2 and Freespace 2. Gameply part is more or less ok, but all of the scenes play horribly and slow. Barely worth doing.
Pretty good selection of games that I've either gotten here or already had. Looking for more! Late 90's-early 200_ games are fine with me, many were pretty fluid and looked great.
What are you playing on your netbook? I'm always looking for more.
I'm on an Asus 1000HE running XP and 2GB RAM.

Dell Inspiron 1526.
3gig ram and that crap. Plays:
Painkiller: Black Edition.
Guild Wars (Screw WOW)
The Guild. Pretty much every GOG game I have.
Star Wars: Empire at War Gold Edition.
Fixing to get The Witcher and if I can find it, The Chronicles of Riddick: Escape from Butcher Bay.
Thats about it.

Fallout 1&2 runs smoothly on almost every netbook you can imagine, I have GOG's versions instaled on every computer i have including netbook

Right now I have:
Beneath a Steel Sky
Die by the Sword
Plants vs Zombies
World of Goo
Jagged Alliance 2
Unfortunately, Space Rangers 2 doesn't want to run on my netbook :( I am using an Acer Aspire One btw.
Netbook

Oh that. I hate netbooks, I can't even run fallout on my old one.

What are you talking about? Fallout could run on my Intel Pentium from 1995

Something with it clashing with one of the computer's hardware. I don't know it baffles me. But I dont care, as my brother now has it and plays Wizard101 on it. Piece o shit.

Refer to the Netbook Playability Thread for comprehensive information on GOG release playability.

I dont use it anymore...

arkose is right. it's by far the best thread of its type.