Interested in showing up your neighbor with the hottest, coolest, hippest, trendiest, have-to-have-at-any-cost add-on for your house? Real estate author Mark Nash has a few ideas for 2007, based on a survey of 900 industry folks. Among his ideas, courtesy of BW's Chris Palmeri:

Upscale garages: Think lots of cabinets, mini-fridges, A/C and heat.

Man caves and Mom caves: Personal space where you can hang out without being hassled by kids, Sparkletts men, etc.

Two home offices: Why can't everybody work in their PJs?

Sustainable Design: A totally green thing, mixing energy and resource conservation.

Rejuvenation rooms: The place to exercise, meditate, take saunas and watch Oprah.

Snoring rooms: Better than the couch and guaranteed to save thousands of marriages.