In no particular order...
Buy custom Disney luggage tags on Ebay, or other.
Start laying out clothing, travel kits, and planning what to bring.
Print out Park maps in color, or buy on Ebay, or hit up some great posters here who offer to mail them.
If you have Xbox 360 with Kinnect, get the Disneyland game (used or whatever)-- just walking around the Park at home is amazing.
Watch family videos or slideshows of previous trips.
Look at restaurant menus.
Practice/learn the DL app (and check out Play Disney)
Watch HOJO Mattercam. If you have a smart TV, the built-in browser or Youtube App should be able to handle it on big screen.
Play favorite Disney music in the house, while making breakfast, family housecleaning, or other activity. In addition to your favorites, you can find endless park music and loops on Youtube.
I better stop here. I don't want anyone to think I have Disney issues. Have fun!