I just bought the new macbook pro this Monday and I had to transfer huge amount of files from my Win7 laptop. I was able to share my Win7 c:/ d:/ and "User" drives on the sharing network. It's pretty easy if you follow this tutorial on youtube.
http://www.youtube.com/watch?v=JSm0YflelJ4
In summary
On Win7:
- join a Workgroup if you haven't; if you're already part of Homegroup, turn file sharing on
- go to the files or drives you want to share with then right-click. Go to >share with >specific person>
- Set up an account for "Guest", and add privileges
On Mac OSx (mine's Snow Leopard 10.6.6)
- Go to finder, on the window type cmd+K or right-click to finder and click "Connect to Server" (both are the same)
- type in smb://[pc name]/user
- Connect
If you want to connect to other files or drives on Win7, just allow sharing with "Guest" by adding privileges, you do the same for Mac with Network Sharing.
Hope this helps.