Good to hear, another needed feature. Seems like nintendo is starting to get a lot of the things that were needed (messaging system, joining games, 3d video recording, dl games off store in sleep, etc.). Maybe if they just used wifi in their games, we would be set
http://www.joystiq.com/2011/11/04/us-copies-of-super-mario-3d-land-also-include-firmware-update/
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Yesterday, we found out that the Japanese version of Super Mario 3D Land packed a mandatory 3DS firmware update, which enhanced security (of course) but also streamlined the friends list, adding a new "Join Game" option.
Today, upon the arrival of our US review copy, we discovered that the same firmware update is loaded on that version, as well, and offers the same amenities. You can see the "Join Game" button at the top of the screenshot above. It's faded out because the game I had running at the time doesn't have multiplayer.
There's more 3DS updating to come, as a more comprehensive update is due this month to add video recording features, along with updated StreetPass games, DLC functionality, and other eShop improvements.