Windows Live Expo has just announced a new update to the service, including integrated payment via PayPal, job listings via CareerBuilder, featured ads by AdMission - initially in the real estate and autos sections, better search, and tighter Messenger integration - showing you "all the things your friends and family are listing - right within the Messenger client!."
New Updates announcement on the Expo Team blog
Take a Tour of the new Expo
Windows Live Expo