I think for a hard / serious / professional user the Eee is just a nice toy. I really wouldn't like to carry one of those big laptops that are very common today, so the Eee looks cool as an internet / multimedia portable device. Also if you work with networks and you have to run scripts, audit, and such, a small portable device is nice. I don't see it as an equivalent of a Laptop, but as a replacement for handhelds, perhaps ipod, sub-notebooks or a portable multimedia station. But doing something like writing code, image editing or any more-than-two-hours thing, no no.
My friend John gave me an Omnibook 900, it is very light and small, I just love it. It is almost the half of the size of my sister's new Aspire. The keyboard is very nice and smooth also, so I can work with it without problems.