My brother has Windows xp on his laptop and I have Ubuntu 10.10 installed and samba is also installed on mine and when I connect my laptop with a desktop running Ubuntu, I am able to see and access the shared files. So sharing works fine between two Ubuntu computers.
My brother's and my laptops are connected through the cross cable for me to access the shared folder on my Ubuntu laptop from his xp shared folder.
I connect both laptops and then ping, ping gives perfect reply and I can see his computer name in the Places > Network
When I try to open his shared folder from there I get and option to enter the password I enter the password but the password prompt pops up again. I tried to enter his password and mine password also but each time I enter the password nothing happens but the password prompt pops again without any error report.