I just got my S&W model 29 back from the gunsmith and I'm just thrilled with it. It's now got a 3.5" barrel, the only one I know of on a .44 magnum.
My gunsmith used to do warranty work for S&W and he had this barrel laying around which he had gotten from the factory when they were cleaning house one time, and when I realized it was 3.5" I had to have it. I looked for over 6 months for a nice pinned and recessed standard barrel gun that I could use (and get a good deal on) and finally found one a few days ago. The standard barrel length for 29's is 4", 6" and 8 3/8", and of course there's lots of 3" special model guns made for Lew Horton, etc, but I've never seen one in 3.5".
I like it because aside from being unique, it matches my 3.5" model 27 .357 magnum. I topped it off with a set of Ahrends smooth combat grips in Silver/Black Dymondwood and now I can't wait to carry it. Here's some pics: