If you think you might be on that list, act quickly because right now absolutely everyone has access to your account at any website where you used that same email address and password. Possibly complete list of their sites: cityfile.com, deadspin.com, defamer.com, fleshbot.com, gawker.com, gawker.tv, gizmodo.com, io9.com, jalopnik.com, jezebel.com, kotaku.com, lifehacker.com, sploid.com, valleywag.com.
Search for your email address MD5 in this list. Note that you can use the “Show Options” thingy at the top of the list to filter out everything but the MD5 you put there. (Use this to get the MD5).
Edit: Whoops, didn’t see the EE thread on this. This might be a better/easier way to check: