The mobile celeron link is for P4 based celerons (northwoods and stuff). The celeron m we speak of is essentially a half-cache speedstep-less dothan. In fact, I think the celeron m is better suited for desktop use than mobile use because not having speedstep on the desktop really doesn't matter when the cpu's maximum thermal envelope is already a low 21W.
Pop it in, overclock high, and have lots of fun!