Update: We just returned from Portugal (ok, about 3 weeks ago). We never got to the Porto Wine Museum, but I think what was called the Porto Wine Museum is now part of the WOW museum which is across the river from Porto in the city of Gaia. We didn't make it to the WOW museum either, but will next time, although some people have said it's kind of a tourist trap. Don't know....
We did visit Calem wine lodge and joined one of their tours. Hmm...I was rather disappointed with the tour. The tour includes like a 15 minute self-guided section of a museum (that part was fun and fine) and then a much longer part which is guided. The guided part is rather terrible, at least the one we had. A young guide went on and on about different stories but hardly anything about the history of Port wine and how the wine is made or anything about the barrels that we were standing in front of. After this guided portion, we got to do some tasting which was fine. It's the guided part that was very mediocre. Maybe other wine lodges offer better tours, though I'm not sure. We only did Calem for tour.