While looking for ways to escape muti-variate calculus purgatory in the final weeks of the semester, more about
I came across Open Math Text. These are a collection of math books (in PDF and LaTeX) that are openly available for distribution and are aimed at general scholars. A quick look at the collection will show that most of the books are authored by Dr. David Santos, a professor a the Community College of Philadelphia. It seems that he has written and made available more books, in multiple languages, than the number of scholarly papers that most researchers publish at full universities.
While looking at his personal page, I found another open textbook collection called Textbook Revolution. The obvious downside is that these publications may not go through the same levels of review as textbooks printed at conventional publishers, however, it is nice to know that there is a group of people actively working to make affordable textbooks available.