What is the best book written on the current financial crisis and its origins?

Yes, Meltdown is excellent. Others would be…

Financial Fiasco by Johan Norberg (and the film based on it)
Crash Proof 2.0 by Peter Schiff

In fact, David Gorden actually gave a lecture titled "Five Best Books on the Current Crisis" at a Mises Circle in 2009. (It’s also here. I don’t think there is any difference between those two links though. For easy download, see the resources page.

I also posted a rundown of things here.

“The Bailout Reader” offers a nice collection of sources
“Austrian Predictions” offers a collection of writings about busts before they occurred.

For specifics on booms and busts, see here. The comments at that link include other recommendations.

Definitely be on the lookout for The Panic of 2008 film.