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[SoapSurgeon]

Bit old school but the original dungeon siege should work and it is really good fun...

 

[Prophet]

Not quite co-op but you could probably get away with Counter Strike. I used to play that on a 1.6GHz centrino laptop around 7 years ago.

 

[Murray]

Not quite co-op but Trackmania?

 

[QlimaxUK]

http://www.store.yoyogames.com/games/168406-sector-x

good simple 2D zombie shooter, free, connects via direct IP

(not a steam game) but if you add me to steam we can link up if you want (Qlimaxe)

 

[mejobloggs]

*edit: nm just noticed he has onboard graphics

What about old dos games? Whacky Wheels was a ton of fun back in the day. Only thing I can think of that will run on integrated

Jazz Jackrabbit 2 if you can get hold of it

Worms of some sort. I prefer Armageddon with the beta patch on their website. Fantastic

 

[Atavist]

Magicka's system requirements say 'integrated graphics not recommended', but it may be worth trying as it's insane fun. Most shooters that are about 8-10 years old should work too I'd imagine and there's a good laugh to be had just playing 1v1 in something like Quake 3 FFA.

 

[Semiskimmed]

worms?