512 is not bad. i run it every day
i'm actually getting 2x256 for my new mobo i'm running now with my single 512 stick. i'll be running 512 until DDRII comes out in early 2004. its just not worth it to waste 250 dollars on a good set of 512mb sticks.
i did have 1gb (2x512mb) when i had my xp2100+ system and it was nice but the rig turned out to not have a home here so it sent it on it's way.
512 is enough for a serious gamer. if you play battlefield 1942 you definately need 1gb if you have the cash. i play it alot and its fine on my 512 but i could definately see the benefit of 1gb on my rig if playing that.