Firstly, well done PnP Bios for writing this and making it available. Incidentally I found some time recently to clean up my attempt at a similar library. I'd be ready to release it but I've been considering removing the SDL dependency, or at least separating it out so that you can use it with anything that gives you the appropriate OpenGL setup.
I'd also recommend the zlib license. That way you keep the copyright but people can use the library pretty much as they please.
I'd also not worry about the vertex arrays vs. glBegin/glEnd argument. In response to similar criticism and benchmarks posted on the thread about my library
be if you used a different texture for every blit.