Protoman:
Tans are basically anime girls that have nothing whatsoever to do with the product and then, in the end, get some logos slapped on them. If you're lucky, it will have some sort of accessoire that, in a weird way, connects with the product. Examples? How about
Wikipe-Tan (yeah, when I see children working as house maids I immediantly think about wikipedia) or
Windows7-Tan (because a boring looking anime girl with clothing that wouldn't seem out of place in 20000 Leagues Under the Sea just screams "Operating System"!)
So yes, they're some sort of weird anthropomorphisation of an inanimate object without even trying to look anything like it (besides the aforementioned logos)
Anime-fans, feel free to add your explanation, I openly admit I never liked those. I'm sorry, it's just that I like anthropomorphism (yes, I will yiff in hell, eventually, thank you very much), but in the real ones the artists try to balance the original look and the human characteristics (I'm not just talking about anthro. animals here. Just remember the candle guy from the beauty and the beast, for a mediocre example) and just drawing a generic girl and then throwing logos at it seems to be such a cheap way out that it makes anthropomorphism in general and the product its supposed to be an anthro off look bad. YMMV, of course.
There's a
whole thread. on the gp32x forums.
D:
well, at least its drawn better than 99% of the "Tan"s I've seen yet