i've had issues in the past with networking to 2000, but the problem ended up being on the windows side. for some reason, before i could start browsing the shared folders, I had to open up the properties for the network connection on the pc side. for some reason, it wouldn't start sending/recieving any packets at all until I did that. after that, wait a few seconds, and it shows up on the mac every time. but if i don't go to the network connections, it doesn't work at all...
*strange*
matt