Flatshare.com
Flat share portal listing rooms for rent and roommates from several UK sites
http://www.flatshare.com
Find A College Roommate
Post an ad to find a college roommate within the US for a small fee or browse the bulletin board for free.
http://www.campusroommates.com
National Roommates
Providing local roommate service for major US cities.
http://www.nationalroommates.com
Flatmate Selection and Security
Accommodation agency in Australia offering to pre screen potential flatmates, or advertise share accommodation.
http://www.flatmate.com.au
Easy Roommate
Matching service for some US cities. Free to preview possibilities.
http://www.easyroommate.com/
Flat-Sharer
Pay service to locate flatshares in the UK.
http://www.flat-sharer.com/
Housepals
Search engine for bedsits, flatshares, houseshares and roommates in USA, UK, Australia, Canada and Ireland.
http://www.housepals.co.uk