There are lots of ways to share files between the two PCs. Samba is a pretty good way, but sometimes gets a bit complicated.
Another way to access the linux box via the windows box is via ssh/sftp. To start sshd on your linux box (if it's not running already) run:
/sbin/service sshd start
Then with windows get an sftp client and log into the linux box with your username/password.
There are ways to mount your windoz shared drives under linux too. I don't use 'doze at all, so I'm not sure what the exact command is, but check out smbclient and smbmount.
You could also set up sharing via the regular ftp server or the web server as well. :)