What a great thread... it's like the a900 club having a meeting around the newly initiated.
Let me tell you something... I shot my second wedding with the a900 yesterday (as a second shooter). Unlike the first wedding I shot, this one was in very bright conditions and I am simply gobsmacked by the files. The whole day was ISO 640 and under... most at 400 or 200. I'm seriously considering postponing my foray into medium format for a bit longer and just investing in a bunch of great glass (and a new computer ) until I can afford an MF system with an appreciable resolution increase over the a900.
The files don't have quite the "bite" of even a 22mp db... but they definitely have the "look" at times.
Terry, I'm glad you've started this thread. It's nice to see discussions about everything from lenses, to UniWB, to arca plates.
As far as UniWb. I use is soley as a way to cram my histogram as far right as is possible in situations where exposure is critical. I had a situation yesterday where a bride had a llloooonnnngggggg walk to the alter... outside... and I took a quick uniwb shot with intelligent preview. I was then able to alter settings in manual and shoot the whole procession with as much ETTR as possible while still keeping detail in the dress. Again... just a means to an ends.
Anywho, I'm rambling on... but thanks to all for the contributions. I've had a great 3 weeks with my a900 and I can't wait to see where this all goes.