What is the most common use of Bitcoin? I'm a total newbie here, and I've read a bit on Bitcoin.  I get that it's a cryptographic currency, and that it can't be directly "cashed", etc. 

I'm interested in the common purchase using Bitcoin - what do you buy with Bitcoin?
I found this link the other day that shows where you can use bitcoins https://www.spendbitcoins.com/places/?place_type=service  mostly for hosting companies, some poker sites/online casinos &amp; many computer co's that i'm sure most people would never use right now.
Saw an article that a restaurant in NY wanted to accept them soon but probably its a marketing gimmick before the crash to get some free publicity.
there is also that article of the guy in Canada wanting to sell his house for bitcoins. I'm sure he's going to need much more bitcoins now after the 2 day crash unless bounces back.

Many have used them on Silk road for buying drugs too but I'm sure gov't going to crack down on that . Heard they caught some guy in Australia recently for Silk Road.

Hope that helps