I have an Asus Eee PC 4G (or 701) running Full XP SP3 (with IE8 and Office 2003) beautifully from a (now rather old) SanDisk Extreme Full-Size SDHC 30MB/s Class 10 Card, with the pagefile set to the Card, since July 2010. It has just an 8 GB (soldered) SSD inside, which came with Xandros (and which remains there untouched), and came with 1 GiB RAM, which I maxed out (= 2 GiB for that machine). On Xandros the battery lasts somewhat longer, but there's hardly anything that can be done usefully on that.
I'm considering upgrading it by replacing its older SanDisk Extreme Full-Size SDHC 30MB/s Class 10 Card by the 45MB/s, which tests I've posted at the beginning of this thread, now that I bought the 95MB/s, about which I posted above. Since they both fully saturate the USB 2.0 interface, those 45MB/s cards (which are already EoS, AFAIK) are a great choice!