I am not a financial expert nor claim to be. I am, however, very interested in economics, human behavior, social behavior and so on. There's tons of (mis)information and it's hard to work out what has actually happened, and therefore impossible to figure out what is going to happen next.
Some interesting info that helped explain it:
The Giant Pool of Money: http://www.thislife.org/Radio_Episode.aspx?episode=355
George Soros' Book: http://www.georgesoros.com/creditcrisis08
The Black Swan: http://www.amazon.com/Black-Swan-Impact-Highly-Improbable/dp/1400063515/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1228100319&sr=8-1 (more general, but GREAT).
The general things you have to know is that basically if you lower the interest rates after a massive tech bubble you are telling banks to loan money to just about anyone... If you don't believe me, consider NINJA loans. That stands for No Income, No Job, No Assets. Hmm... that doesn't sound like a very conservative strategy. There's all kinds of really fun things that people came up with in order to keep pouring money into the economy. You can research CDOs(http://en.wikipedia.org/wiki/Collateralized_debt_obligation), CDSes(http://en.wikipedia.org/wiki/Credit_default_swap) and MBSes (http://en.wikipedia.org/wiki/Mortgage-backed_security) all the leveredge associated with those.
Anyway, this is a passing interest of mine and rather than posting pages and pages of information, I recommend just reading the above and then keep digging from there. The key for me was figuring out that CNBC, CNN and FoxNews certainly don't explain it.