just logon and access needed files
Alternatively, if both computers are on the same network (and have same programs etc), you can just logon to the other computer and access required files working.
I do this often so that I can work on the imac but access files fro my MBP. It works so well I think I'll jump to a MBA next and try to do serious graphics work on the imac wherever possible and hence bypass the "power use" issues surrounding the MPA.
Only concerns I have now are;
1) How much will I miss a 17" monitor when going to a 13"
2) Can I live without backlit keyboard (not sure I want to, lets hope for the next refresh)