Yes, Asus seems to be CHEAP like hell with high specs on most. However, I've picked one up before and the build qual "feels" iffy. Not to mention those things heat up like a BBQ with children dancing around it.
I actually bought my brother a mid grade Asus for christmas. and it doesnt heat up one bit even on a comforter. i guess its the model. (2.2ghz/ decent GMA for 479) as for mine. i think it averages up to the center of an atomic bomb explosion for my hp tho.
vaio, runs somewhat warm... not too bad.
Sorry, I meant the lower grade ones. I noticed the mistake only when you pointed it out. Sorry.
But yeah, lower grade Asus seems like crap. Of course, the netbooks seems more well built, but somehow the notebooks in the lower range seem flimsy and floppy. MSi is one I'd recommend instead of Asus if you want the "budget" area.
Also the use of a GMA vid card will probably lower your heat quite a bit. Same as a lower speed HDD. However the biggest one is the design of the case. Which either allows airflow or not. Also the processor type can also be another pointer as to whether or not your computer will run hot. A lower grade T series and even the higher grade T series will run hot. (Though afaik, higher grade idles at a higher temp, but doesn't go as high temp on load?) The P series and SU series are generally cooler than the T series. AMD procs are warm too, but generally are also around the temperature of about the T series notebooks.