My Creation Kit updated automatically, and now when I try to use it, Steam says "This game is currently unavailable. Please try again at another time." Does it work for you guys? Or should I just reinstall?

It's working fine for me. Try quitting Steam, then go into your \Steam folder and find a file called ClientRegistry.blob. Delete it, then relaunch Steam. (This may take longer than usual as it has to regenerate that file.) See if the CK works then.

That error message is a common one when the ClientRegistry.blob file's gone off; deleting it and letting Steam recreate it is the standard solution.

Ahh, that worked... thanks SO much!