Windows Network gone in SL?

Any idea why I can't see any of my networked Windows computers, ever since I upgraded to Snow Leopard? (from Tiger)

After upgrading (via "upgrade" install), I immediately noticed that Network disappeared from the Finder sidebar, and when I go to it via other means, nothing's in there. (been digging into this for quite a while, but can't find anything yet in Mac Help, or Google. I might be searching for the wrong things, because I don't understand what the issue is exactly)

HAve you opened Finder Preferences - General tab - under Shared, place a check next to Bonjour computers.

Yes, but nothing shows. Previously, there was "Network" listed at the top, next to Macintosh HD.