Hey, actually I've got some GREAT tips!
If your house is a mess and your inlaws call to tell you they're intown and will be paying you a visit in, say, 10 minutes, don't worry...
If you have one or all of the following appliances, use them to put "STUFF" in: dishwasher, oven, washing machine, tumble dryer, the cupboard under the sink...
Vacuuming: Do only where you'll actually look (not under teh table, couch, whatever...)
Bedroom: More storage room under your bed!