If you are eligible for 3DS ambassador status, your ten free Game Boy Advance games are now available to download via the "redownload" section of your eShop menu. Yet again, it's a process of finding the games in your queue of previously downloaded titles, and obtaining them one by one, but it's worth it this time!
[Edit: As pointed out in comments, you can now queue up the downloads by clicking on each item, hitting the "download" button, then hitting the "download later" button and confirming. Once queued, you set the 3DS to sleep mode on the Home menu and they download. Still fiddly, but not quite as lengthy.]
The North American games are confirmed to be the same as those in Europe and Japan, meaning that titles like The Minish Cap, Wario Land 4, Fire Emblem and Kirby and the Amazing Mirror are on offer. Yet again, I am highly impressed that Nintendo put some high quality games out there, and didn't rely on obscure crap.
Nintendo, you done good, son!