Transferring files?

The most basic way to do it in this history of computers: file sharing.

You need to turn file sharing on first: go to Apple menu > System Preferences > Sharing. Check the box for "file sharing". Now, do the same thing for your other computer.

With your Ethernet cord connected, in the Finder, open a new Finder window (go to File menu > New Finder Window). Your other computer should appear in the sidebar on the left, under the section called "Shared". Click on it to connect to it, and access it by typing in the username and password for that computer.

 

Not sure on Ethernet

I'm not 100% on this because I can't find the exact thread I read this in but:
I believe it's faster using Firewire 800 if possible to do this transfer over the ethernet cord. Something about the Firewire can maintain a higher speed. If someone can check me on this it would help, but I'm pretty sure you should try Firewire 800 (maybe even 400, if unable to use 800).
Like I said, don't quote me exactly on this, but I swear I read a thread arguing the transfer speeds on this stuff a while ago on this forum.

 

I thought the same and I googled it; http://www.lyberty.com/tech/terms/usb.html

Seems firewire is faster, however when you have gigabit Ethernet, Ethernet is faster.

But Ethernet should do.

p.s. you could also try a usb stick. http://www.amazon.com/s/ref=nb_ss?url=search-alias=aps&field-keywords=usb+stick&x=0&y=0
You can get 8GB already for "only" 20 dollars.