You're running into the spam/moderate filter. I don't know for sure how Brian has it set up, but certain behaviors will cause it to trigger - in your case, I suspect it was embedding a graphic with minimal text in the message (I saw it and cleared the moderated flag for the message). If a message triggers the moderate filter it's marked for the moderators to look at - which we do fairly regularly, and posting it a second time will merely cause both to be in the moderate stack.
Most of the time, though, messages go through without hitting it - I'm seeing 1 every couple of days on average.
... Bruce
Returning & editing after finishing my swing through the new messages. Your last couple got caught because of embedded links. That will clear up after you've been here a while -it's there to stop the spam link messages we get a lot of.
