Server?

Im not a new mac member, but i own a mac book tiger, and i was looking for snow leopard. But the reason i post this is, I was wondering whats the difference between Snow leopard and Snow Leopard "Server".

The 'Server' designation means that the OS comes bundled with things such as OpenDirectory (for user/group/resource management) and host of other features that are meant to be used to manage and 'serve' client machines on a network.

You typically would install the server OS if you were managing multiple Macs in an office of home office type environment.

ok so can transfer stuff from mac to mac?

Yes, you can easily transfer files from a Mac to another Mac. This Apple KB article about Migration Assistant might be of use to you.