My Admin Guide (beta version) list the following services for Windows clients:
*File services
*Print services
*Windows Internet Naming Service (WINS)
It doen't directly talk about being able to browser windows client systems, though they can browser directories on Server. As for what you need:
"To support your Windows clients, you only need your Mac OS X Server software. Unlike previous Apple server products, Mac OS X Server comes with built-in browsing and name resolution services for your Windows client computers. You can enable Windows Internet Naming Service (WINS) on your server, or you can register with an existing WINS server."
Without having Mac OS X Server connected to Windows clients, I can't tell much else about it's abilities in this area.