Browsing Windows computers on a Windows N/W

I'm running OS 10.5.8 on a G5 iMac. It's on a network with PCs running Windows 7 and XP Pro and one that runs Ubuntu 10.04 Linux. The others can see the Mac, but I don't see how to "see" the shares on the Windows computers. How do I do that? I also wish to set up Windows shared printers.

Thanks.

what you need to do, which is what i do with my storage server running win7 is. you need to goto Go>connect to server. use (SMB\ip address of the computer). you do that then you'll be able to connect to the shared files and folders.