I have the 3" SP101 and the extra inch adds some weight, making it a little easier to handle with the .357 cartridges and gives a better sight radius. It doesn't really effect the bulkiness of the gun, so it's still easy to conceal.
S&W Model 60's come in 2 1/4" and 3".
S&W Model 66's come in 2 1/2" and have been made in 3"
Ruger Speed Six or Service Six were made in 2 3/4"
S&W Model 27 came in 3 1/2".
You can still get a ruger sp101 with the 2.25 barrel on it. Is it next tuesday yet? I get one to mess with then.
Some can also be custom jobs. I ran into one guy at a range who had so much in his revolver for trigger job and custom work that when he wanted a snubby he just had that one shortened down. He picked something longer than 2 inches and under 3 inches from what I recall.