Book HI hostels and HI youth hostels globally with HIhostels.
http://www.hihostels.com/

Directory of Japanese hostels affiliated with Hostelling International (HI); reservation information.
http://www.jyh.or.jp/

Hostels & cheap hotel accommodation available in over 100 countries worldwide. Students, backpackers and budget travelers get the best prices for youth hostels and budget hotel ...
http://www.hostelbookers.com/

Cheap accommodation with private or family rooms at over 200 city, coast and countryside UK locations. Wild, remote or action activities throughout England and Wales.
http://www.yha.org.uk/

Hostels provide budget-oriented accommodation where guests can rent a bed, sometimes a bunk bed in a dormitory and share a bathroom, lounge and sometimes a kitchen.
http://en.wikipedia.org/wiki/Youth_Hostel