Lost Theories?

I thought it was slated to end in 09 - Next year. Regardless, they have me more confused this year than I have ever been watching any other show...Why does Kate have Aaron? I heard something about there only being 9 survivors of 815 - what is that about? What happens to the rest of the people on the island? Also, where did Kate get her money for that house?? And poor Jack, my hear just breaks for his character once he is home... It still keeps me watching, but I just don't know what I am watching anymore!