Jim: Nice shots.
I also bought into the Panasonics as a travel system, and have been quite pleased, specially after dragging a Nikon system around for years. The 100-300 is very nice -- that's a relatively short hand-held 600mm equivalent. My whole system, which includes three bodies and most of the lenses (I think -- no fisheye, if that's out yet, and I decided not to buy the 0.95) fits in a Kata bag that will go into the overhead even on regional jets. The combination of the GH2 and the GF1 is especially handy, since they use the same lenses (but different batteries, sigh) because the GF1, with the 20mm, is no bigger than a large P&S, and even with the mid-range zoom, it's very compact. From there, you can move to a GH2 which I find to be a terrific street shooter. And if anything goes wrong with either of them, you have a backup that uses all the same lenses.
I've also been testing the Pentax K5, which is fully weatherized, and not greatly larger than the GH2. Because you're not tempted to buy dual-purpose FF and APS-C lenses, as I did with Nikon, the lenses for the Pentax remain reasonably compact, although not nearly as compact as the Panasonics. I would say that the K-5 is a stop and a half better than the GH2 -- ISO 6400 cleans up nicely, and though ISO 6400 might not do for oversized art prints, it does well enough for my purposes. I also took a bad fall a couple weeks ago, almost broke my nose (with the camera) and cut my hands up. The camera took a heavy hit on one edge, by the battery door, enough to seriously groove one corner of the body, but it still works fine, which gives me some confidence in it. I think the GH2 would have been more affected by the fall. I do not think that I'll again be doing air travel with the Nikon system.
JC