DIY Photography on the cheap
design in-flight has a good (and very in-depth) article on low budget photography:
Who this is for: You: owner of a small design company, a seat-of-your-pants freelancer, or perhaps an under-appreciated intern in the marketing staff of a big corporation. You wish to improve what you can offer photographically for your projects, you might only own a mid-range consumer digital camera. Read on, this article is intended as a helpful starting point.
In the end it will only set you back $77 - not bad!