2nd EDIT: The m11x from Dell looks great to plus its 11"!!!!!
This is actually a very interesting laptop. If the battery life claims hold true, it could actually double as a true portable system, which does not need to be tied to an wall socket all the time. Some sources claim that it even comes with 3G... or something, considering it's claimed to have a place for SIM-card.
You should probably try a netbook with similar screen size, so you'd know whether it's large enough to provide enjoyable gaming experience. Since it
is small.
Keyboard probably is undersized as well, considering the screen size. Whether that's an issue probably depends on how much you want to type, and if you can adapt to a smaller keyboard. I tend to make typos with my Aspire One... while the keyboard feel is decent enough for a modern laptop (read: plastic crap, especially compared to older Thinkpads), it is smaller than Thinkpad's keyboard, so I have some troubles hitting the right keys (I touch type, although not particularly well).
And of course, it's Alienware design, so the looks might or might not be your cup of tea.