You could try using pdfimages. It is part of the xpdf-utils and also in the poppler utils.

The man page can be found here:http://linux.die.net/man/1/pdfimages

@#20 I don't think Photoshop will count as opensource...

The idea hasn't been gone completely. Holland still features some hitchhikers spots (liftplaats) in a lot of cities. Since most students nowadays have relatively cheap access to public transport.

Some more infos can be found here: http://en.hitchwiki.org/?title=Liftplaats