The Guardian has a good reputation and their Guardian Jobs is great if you're looking for a job in the UK or abroad. They have TEFL and international school positions out there. In addition to teaching jobs, they also have administration and management ones.
You can browse by category, job level, location, salary, function, sector, hours, contract, listing, time posted and the type of employer. There are some really good jobs out there, so take a look and see what you can find.
Got an idea for a job site?
Email me with your job site, name, and website (if you have one) and I'll post it ASAP.