http://www.karmawish.com/
Exchange of services in a hospex type fashion. Credits are counted and exchanged for "wishes".
http://belodged.com/
Hospitality exchange web site. I know little about it.
http://www.hedonisiahawaii.com/
Work exchange 2.5 hours or pay $35 - $40 a day. Eco-hostel, solar showers, outdoor toilets, the whole nine yards. :-)
http://www.google.com/calendar/embed?src=couchsurfing.sydney%40gmail.com&ctz=Australia/Sydney
Google Calendar for CouchSurfing events in Sydney.