you'll need to change the Mac's workgroup with /Applications/Utilities/Directory Access. Authenticate, click on SMB, then click the Configure button. Change the workgroup to whatever you need. After that, you should be able to see your windows shares in the Finder under Network.
I have tried this and no results either. I find networking in panther to be a real retrograde step compared to Jaguar.
I had absolutely no probs getting windows and mac networking up on Jaguar and my Jaguar emac on my network still sees the PeeCee absolutely every time. Apple needs to sort this out NOW!
BTW my local apple reseller says heaps of its customers are spewing about this issue and apparently it is not a consistent fault - some machines have the problem - others don't.