In my experience, if they're hiring full-times, they'll at least consider hiring an intern if the right one comes along. Startups especially.

If some place is hiring, ask anyways, and remember to ask them to point you to other places if they're not hiring. They're likely to know others in the field that are.

The worst case is that they'll say no.

As a student, I tried to build out my Github profile. It worked to my advantage as now I am employed (on a contractual basis, but it's work nonetheless) because of my Github profile.

Once you have open source out there, finding work is easy. Maybe try freelancing? Some of your friends might need a website... You have to learn somehow, might as well be in the trenches.

Scribd is hiring interns, both for the summer and for during the school year. We have two interns now and it's working out great.

http://www.scribd.com/jobs

Those come up from time to time, but generally not at the end of July.