A good start is to check out my blog here at eLearners, My Penn Foster College Experience. I am currently a student at Penn Foster, and I have really enjoyed. Keep in mind that this isn't really an "online" program. It is basically a correspondence program, with most materials being mailed to you, including textbooks. You take the majority of your exams online, with the exception of the final proctored exam for each course.
There is help available by calling the instructors, which I have actually never done, but otherwise you are on your own in your studies. Some of the courses were a bit easy for me, but others (you mentioned accounting) are quite rigorous. Overall, I have been very satisfied with my studies at Penn Foster College and I have learned a lot.