If you're searching for a job in UK, well, I can advise you to look at ClickAJob.co.uk. When I needed a job, this site was really helpful.

What I really liked is a possibility to search vacancies from lots of job boards at one place.
It's very fast and efficient. There is one feature that impressed me greatly - you can search jobs by location entering a UK city or postcode into the location field.

The site address is http://www.clickajob.co.uk.