The Associated Press writes about a growing network of people online who’ve gone a step beyond hotels, hostels and even apartment swapping in their travel planning: They sleep on each others’ couches. A number of Web sites have sprung up to help pair travelers searching for a place to crash and hosts with a spare couch. Sites like hospitalityclub.org, couchsurfing.com, globalfreeloaders.com and place2stay.net are often free, serving only as middlemen and offering tips on how to find successful matches. More …