well i think i just qualify to join the topic recently....... as i have upgrade to 2gb from 1gb.........

well in terms of normal window operation all are still well, not much difference but gaming do make the difference....... especially u get a low lantency rams too........ windows will take about 400mb of rams to run and 600mb is not quite sufficent for some games, so addition even for 256 to 1gb i think would just do a lot of difference for game like BF2, BFME2; these games are need a lot of rams to store the gaming data i guess......

anyway i douby Vista would run properly on 2gb of rams........it seems my beta version is quite resource hungry when i try to stretch it out a bit