It looks like they were able to pop one account (@
Viskoner) last night, and have used it to send an annoying spam to a number of members via PM. I have since deleted all of them, so if you received a notification and yet don't see it now; that's why. Viskoner's password has been changed, and I had to change his email as well, as I have no idea whether it points to him or the spammer. If you are reading this, please use the "contact us" link at the bottom of any page to get in touch and work to get your account restored to normal.
I didn't receive one here, but I got the same spam via a PM on another forum I am on last night as well, so this looks pretty widespread.
Use appropriate passwords, and change them every once in awhile to minimize the chances of this.