I would definitely second Khan academy. I did this over a year ago and it was well worth the time and effort. I also supplemented with Purple Math. What was

I would definitely second Khan academy. I did this over a year ago and it was well worth the time and effort. I also supplemented with Purple Math. What was great about doing it was that it really filled in gaps in my own knowledge for things I didn't pick up in high school. For example, I know trig well from writing a lot of video games, but for some reason I had never learned about 30-60-90 or 45-45-90 triangles.