My PC 768MB RAM (for insiders, the max that BeOS can take ;). However, I'm often running lots of other applications in parallel - Poser, Visual Studio, CVS, Cinema 4D, Photoshop, Trillian, FireFox, OE...never felt the need for messing with my memory settings. When the system was new, XP did pop up the little window telling me about a small swap file and that it's going to increase it, but I guess by now it has adjusted to my heavy use.