I don't know if I've said this before, but there is such thing as doing too many internships. After one, you should be able to start applying for entry-level positions. You can do as many as three, but more than that and potential employers may start to ask why you haven't landed a job yet. Joe Grimm on Ask the Recruiter
points out that even more important is how long you intern after becoming employable (e.g. graduating from school). If you're getting nowhere with the job hunt, put your efforts into freelance gigs and networking instead of doing another stint as an intern, even if you have to get a part-time job outside the field to support yourself. You'll build contacts and your portfolio, which is more valuable.