[makuro]

You might want to give InternMatch a try:

http://www.internmatch.com

They've also got a competition going. Not sure what timeframe its internships are for, but here's a link:

http://www.internmatch.com/500-interns-competition

[wikyd]

The timeframe for these internships is rolling. I'm sure most of the startups would accept an intern tomorrow, but will wait for the summer as well.