I also bought mine yesterday and put Ubuntu Hardy on it last night. Followed the howto religiously (but enter sudo m-a a-i alsa twice; it fails the first time, but works the second; then do a make install in the madwifi directory again as the alsa install will have broken it)
It has 1.5GB RAM. I gave it 500MB of swap, which I don't think it's ever used yet and is probably unnecessary. (I was told a told time ago by a linux geek that as long as it has *some* swap it lets the vm/scheduler do smarter things, and mmap executables; she then went on to prove the point while building a kernel on an IBM PS/2 by using a floppy drive as the swap device and it did indeed make it quicker! But that was in the days of the 2.0.3x kernels, and I'm not sure the wisdom still holds in these less civilised times.
Ubuntu, however, works great. Very slow until I completed the SSD tweaks someone linked to. Now no complaints about speed. Now I have the netbook-remix stuff installed and that's mostly good too though not entirely solid yet. (VMWare Server 2 console seems to kill maximus (I haven't installed vmware itself; just used the console to point to an instance on another machine); and you must turn compiz (ie: desktop effects) off before the ume-launcher will work properly.
I don't care about longer boot times as I just let it suspend when I'm not using it. It shouldn't have to get rebooted unless the kernel's being upgraded :-D
The only fly in my ointment is I seem to have one of the whiny aspire units. (Noisy fan problem; i wish i'd found the thread in the hardware forum sooner.) lm-sensors under Ubuntu doesn't recognise any sensors, so no software fan control seems to be possible. Need to find a solution to this as it's a bit of a dampener on actually using the thing for real. :-( But that's not really an ubuntu-specific problem; I don't think this was fixable under Linpus either.