What have you NOT used in the last 6 months? Can you get away with not using it again?!? Things such as sheets and towels can be packed away with just what you "need" out.
plastics cupboard is always a good one to declutter.
Ordaments (keep out a few to make the house look homeee)
throw out anything u havent used in 12 moonths, trust me you'll be suprised how much stuff u chuck!!
books, dvds and video games are good to pack early too
Bookmarks