It works for me to access my Windows shared folders.

Tips:
- Make sure you can access your Windows shared folder from another Windows computer first. Make sure sharing is enabled. Resolve any issues with password protection, firewall blocking, or (in my case) this silly Windoze issue: http://www.pcdoctor-guide.com/wordpress/?p=174
- Specify the computer by IP address (the N800 can't resolve Windows computer names)
- Specify the shared folder you want to access (e.g., "Documents" by default in WinXP)
- Specify a username like N800, and a password only if your Windows share is set up to use username/password access
- Specify Samba as the type instead of NFS

You can use Quick Mount, but obviously it's better to save a Bookmark if you are going to use it again (but remember to verify same IP address in future).

Mount the shared resource in Wizard Mounter.

You should then see your shared Windows directory pop up in the N800 file manager under Remote_filesystem

The entries under Remote_filesystem don't disappear when you UnMount the share in Wizard Mounter, but they show no content. You can delete these entries in the file manager to get rid of them.