Looking for Work
Europa Pages
Europa pages' jobs section is one of the best, pulling together a lot of the jobs that you find on other sites; go to: http://www.europa-pages.com/jobs. The jobs aren't just in Europe, either. When I last looked, most seemed to be in the Far East.
ESL Cafe
ESL cafe is a great all round resource for teachers, but it also has discussion boards where people post job ads and recount their experiences of schools, both good and bad. Link: Dave's jobs discussion board.
ESL Junction
Like ESL cafe, this is a discussion board, but it's one where employers post jobs and you can find out about the relative merits of schools. There are separate boards for Cambodia, China, Indonesia, Japan, Korea, Laos, Malaysia, Taiwan, Thailand and Vietnam. Phew! Link: http://www.esljunction.com/jobs/portal.php
Country-Specific Sites
Thailand
Ajarn.com - link provided by Kate from Nottingham, who describes it as "a really great site for teaching in Thailand". For other useful Thai links, check out Kate's message on the discussion board.

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