Thank you very much Entertainment Weekly (sarcastically) for adding still a fourth episode count into the already confusing mix. We now have, as of the end of season 8, either 148, 154, 155, or 156 episodes. Here is how each is correct in its own way: 148 - counting all one hour shows as one; 154 - counting all one hour shows as two, but ignoring the existence of "Highlights of a Hundred"; 155 - same but counting the one hour "Highlights of a Hundred" as one episode; and 156 - counting "H. of a H." as two episodes.
As far as I know, EW is by themselves with the 148, 154 agrees with Dennis K's internet list, 155 agrees with Sogaard's internet list, and 156 seems to agree with Jerry Seinfeld himself and Sony. WHICH IS IT???