We don't move until June, but our plan currently is to see if we can talk to the companies that send us major items of mail and either go paperless for some (like cc bills) or see if they will forward overseas (like student loan bills, scientific journals). If not, we are going to have the important mail forwarded to my parents and the rest (catalogs, etc) will just have to go to heck!
I thought about just forwarding everything from the post office to my parents, but then realized with how many catalogs and crap I get that might be silly.