Lately, this term is getting a lot of attention!  Cryptolocker looks like this:

First thing to know, if you have this on your computer, currently at this time, your data cannot be recovered using "normal" methods.  So, we recommend you protect yourself from this one. 

Anti-viruses, Anti-Malwares and other such tools for some reason are not protecting people from this one (not a "sky is falling thing" I promise)

Fortunately until we have a better permanent solution, there is a nice tool out there.  Check this guys webpage and see if its something you could use:

We have it installed here, on a couple of machines, seems to not be annoying, and so far we haven't gotten the Cryptolocker!