Well, I've done minor OCs (2.2 to 2.31ghz) with my old 130nm K8 lappy. unfortunately most laptops are so locked down that just managing to control clockspeed is an achievement and stability goes away quick. To be honest, I'd want to know that my laptop's overheat protection is working well before even trying ANY OC, but luckily my laptop is so old, that I'd shrug it off if I blew it up.
Now the idea of AMD bringing affordable quad core laptops to the market is pretty cool, but what I'm really interested in is AMD's 3rd gen Ultrathin platform.With Intel you have a choice between powerless netbooks, and expensive ultrathins that have neutered MHD4500 graphics. AMD's current (2nd gen) ultrathin can punch in at $500 with decent power (1.6ghz K8 X2) and graphics that can bitch anything but Ion. The third gen should switch that 65nm K8 out for a faster and much more effecient 45nm K10.5, dramatically increasing battery life, while hopefully the new 8 series chipset IGP will increase AMD's lead over Intel with IGPs. (remember, intel's highest clocked desktop IGP is competitive with the 3200, the mobiles are all 20% OR MORE slower)