This study probably applies to hotels more than hostels, but it's still interesting.
What Percentage of Your Business Comes from the Internet?
From Your Website: 23.5%
From Major Chain/Brand Website: 12.2%
From 3rd Party Online Intermediaries: 20.4%
There is an interesting section on Web 2.0:
What type of Web 2.0 marketing initiatives are you planning for 2008?
A blog on the hotel website: 47.06%
Photo sharing functionality on the hotel website: 41.18%
Sweepstakes and contests on the hotel website: 29.41%
Survey and comment card on the hotel website: 59.8%
Subscribe to a reputation monitoring service: 27.45%
Create profiles for my hotels on social networks (Facebook, MySpace, etc.): 43.14%
Actively participate in blogs that concern my hotel: 26.47%
Advertise on social media sites: 9.8%