Certain beers tend to crop up around the same time at several of the major beer stops here in Maryland? For example, I'll see something from say, Weyerbacher at my main hangout, Frisco Grille. And then I'll look around or be on the road and see it on the lists at either Max's or Mahaffey's or The Judges Bench, etc.
It makes sense as the vendors hawk their wares on the main beer places, and I think its a positive. There's still plenty of variety among these watering holes and they don't seem to carry specific beers all at the same time so we can see them space them out a bit and follow certain beers around town, if you will.