The Iowa Caucas ... what does it mean?

[arabian]

I've just begun to get somewhat into politics and so don't really know what it all means. So would someone smarter than me and/or more knowledgable about politics be willing to give me a breakdown of the what the Obama (D) / Huckabee (R) wins meant last night. I know that New Hampshire is the biggie and is coming up. Aside from a breakdown of what it means, what's coming up, what does this say for Obama's chances to get the nomination for the Democratic ticket?