I recently installed some Avid Matchmakers on my Niner. These things are great little widgets. Short story: if you have Juicy brakes, and newer SRAM trigger shifters, get some Matchmakers and unclutter your bars! In addition to uncluttering, the other big win is that you can take the brake and shifter off without removing grips (you could do this with brakes before, but the shifter clamp was single bolt). Sure, I use lock-on grips, which make this easy as well, but the whole thing is just a nicer overall setup. I highly recommend them.
Also, for those who may be wondering - there is some adjustment in terms of how the two levers are positioned in relation to each other. The shifter mounts to a bolt on the brake lever's clamp. This bolt fits within a hole that gives you rotational movement, allowing you to rotate the shift lever either all the way up against the brake lever, or maybe as much as half an inch away. I run mine nearly right up against the brake lever, so it's a non-issue for me, but I suspect the range would suit nearly everyone.