What are some of the best bang for buck ways to market a new business?

[Jason Kent]

This year I started a computer repair business, and I'm currently working my business full time, but I need to get more customers in order to be viable as a business.

All of my customers have been very happy with the service I've provided, and several have been repeat customers, but I'm having a hard time getting new customers.

Currently I'm doing advertising online with superpages/yellowpages and pay per click with the big search engines. I'm also getting in the local yellow pages, but I need to wait a couple of months until the new directory comes out. I've also started a facebook fan page, a twitter page, and a blog with articles I hope are helpful for my customer base.

I don't have a lot of cash to invest, but I have time. What do you think I should do to get the word out?