You can get decent language audiobooks (including Pimsleur) from audible.com. Don't know if the iTMS has them (but you can get some decent Asian artists on the iTMS).
There's also a few software programs for OS X on language learning. A couple of years ago, an electronics store had a deal going on and I picked up Mandarin (I've taken some classes in it and can speak a little bit), Malay, Thai and Japanese (know a few words and phrases in each language). I've not much with the software but I have listened to Pimsleur for German, French, Mandarin and Arabic.