Finally decided to make a thread for all the Magi omake out there.
Ohtaka is very passionate about Magi, and she is really open about sharing drawings with her fans.
She currently runs two blogs:
Her websunday blog is where she posts a picture or a sketch relating to Magi each week and talks about small stuff. Every entry is named after a chapter, though she doesn't always talk about the chapter itself. These are delayed a month after the chapter's been published.
Now, for translations!
Her websunday blog is slowly being translated into English by azurempress on tumblr.
Most of Ohtaka's tegakie blog has been translated into English, by various good sumaritans:
More translations here: (I'm putting the individual posts because this person mostly translates yaoi doujinshi)
Magi volume omake can also be found on youdontknowthings, though recent volumes haven't made it there.
If you see other omake floating around on tumblr or the interwebs, feel free to contribute! And of course, we can discuss them as well (Alibaba is going to be forever alone, isn't it? xD).