Monster is one of the biggest job search sites, and has listings from around 50 countries. It's also one of the oldest, having been around since 1994. And it possibly also has the coolest name! In addition to posting all types of jobs, Monster has loads of career advice articles. As a bonus, you can block selected companies from being able to view your resume -- which is crucial if you don't want to broadcast the fact that you're searching for a new job to your current employer.
But Monster is just one of a whole bunch of great websites that can help your career search -- click through for the others!