I've got VMWare Fusion v2.0.4 running a copy of WinXP Pro SP3. As you can see in my sig I'm running it on an 8 core early '08 MP with 12GB of RAM. Right now VMWare is set to use 2 cores and 2GB or RAM and it seems a little sluggish although I'm not running anything more than MS Office, Quickbooks Pro and some other apps specifically suited to my business (website optimization and paid search consulting). VMWare says I can devote up to 8GB of RAM. While I think 8GB is overkill and Windows couldn't even use that much, does anyone know what the optimal amount might be to maximize performance? To make it more snappy!