Most Netbooks have built in intel Graphics, actually this is ok for WinUAE but you'll have a nicer experience with a proper graphics accelerator.
I have one of these:
It has switchable graphics between onboard Intel and a 512mb Geforce G105M
This badboy can even play games like Crysis and Call of Duty 4! Yeah on a Netbook
Ok they are a little slow, <25fps but they run well enough to play.
And all emulation I have tried works great, N64, Megadrive, Snes, Amiga(awesome)
I have an RTG workbench setup at the native resolution of 1024x600 and have all WHDLoad setup oh and even ShapeShifter so I have my Windows PC emulating an Amiga emulating a MAC! And even that runs great!
I can't speak highly enough of this Netbook, its the only one I know that has a dedictated Graphics Card.
I'd be happy to make a little video of it running for you?
I got mine for £175 (2nd user but like new) from eBay about 3-4 months ago, best purchase I made this year