Passwords seem to be hashed. I think this is to be expected since this is such a techy thing (currency?), but still nice to know. Now whether they are hashed and whether the algorithm used is safe are a different story.
EDIT: Ops, I missed some hashes.
It's worth noting that crypt-ed MD5 (which appears to be what's in use here) is fairly weak on modern hardware when compared to an alternative like BCrypt. There's some basic information available on Wikipedia: http://en.wikipedia.org/w/index.php?title=Crypt_%28Unix%29&#...
For the other hashes, the fact that there's no nonce or other value stored alongside them was a strong hint (although it doesn't rule out a site-wide nonce). However, I confirmed my suspicion by Googling one of the hashes: it was on a list of unsalted hashes that had been brute forced (unrelated to this, the password was fairly common).
CRYPT_MD5 - MD5 hashing with a twelve character salt starting with $1$
So the hashes you see beginning with $1$ are probably salted.
http://codahale.com/how-to-safely-store-a-password/
[Edit: I meant your typical web application mucking about with salts, not their use within properly thought out things like bcrypt]
Salts will prevent the typical rainbow table attack where you have precomputed hashes for a large number of attempts. Salts won't prevent brute force, but bcrypt will make it so that brute force takes too long for a single given user.
The $1 is for MD5, the salt includes that $1 and the last $, so to crypt the text in php you do crypt($password, '$1$salt$'). Use single quotes to prevent $ from turning into variables. $password in this case (according to mtgox) was md5('password string').
" Graphics processors can speed up password cracking by a factor of 50 to 100 over general purpose computers. As of 2011, commercial products are available that claim the ability to test up to 2,800,000,000 passwords a second on a standard desktop computer using a high-end graphics processor. [3] Such a device can crack a 10 letter single-case password in one day. Note that the work can be distributed over many computers for an additional speedup proportional to the number of available computers with comparable GPUs."