Please don't get discouraged!! It may take months before the "perfect" opportunity comes along. As long as your bills are being paid and you're working at it, don't feel bad about any of it. Does your university have job placement assistance? resume writing helps? interview skills workshops?
Like Jakkie, I registered w/several temp agencies and was always working. I did temp on and off for four years. It was great experience, exposed me to a variety of working environments and helped me to focus toward what I wanted (or in some cases away from what I didn't want) In some cities, temp agencies are the only way to get hired by the big employers.
You can do just about anything through a temp agency - filing, light clerical, industrial, accounting (I've done 'em all, I was known as the Jill of All Trades at one agency) A good agency will sit down and go over your resume,experience and employment goals with you and find out what you'd like to do, then try to match you up with a good assignment. A bad agency will request a copy of your resume, have you do a typing test, tell you they'll call if anything comes up and send you out the door.
If you're patient, extremely flexible and have reliable trans., you can get great things from a temp agency!! I've worked with a few, but by far my favorite (and most helpful) was Randstad Staffing. They're a global agency, based in Holland but they have offices all over the east coast and are expanding every day. Try Express Personnel, too. Don't rule any out, but the national names usually have more opportunities than the little local shops. Feel free to PM me if you want any more details.