Try enternships.com - its a really great site that lists entrepreneurial jobs (mainly internships). I am from Ireland and got a job with a startup in San Francisco for the summer. I found the job posting on Enternships.com. Looking at the site now their database has grown hugely since I found that posting a few months ago. Would highly recommend it! Let me know how you get on!

If you are in the UK, you could try http://www.coderstack.co.uk/

What is your skill set? developer? designer?

Developer: .NET, Java, Axum, Cloud Computing, Perl, C, SQL and NoSql :), basic Perl and Ruby, Windows (Win32 API) and Linux