Not sure if this has been posted yet, so here goes...
The iPod mini seems to work just fine with the inMotion portable speaker rig from Altec Lansing. My 30GB was suffering from major screen problems; I finally sent it in for repair when I got my mini, the entire time the unit was in service I never thought to try the mini with the inMotion set. Today my replacement 30GB arrived (brand new and with the blue, not white, backlight... thank goodness!) and it finally dawned on me to give it a try. The mini "stands" in the "cradle" and does not touch the back support at all. I'm not sure how much stress this puts on the male end of the dock connector or the dock connector itself for that matter.
Sound quality was normal, no cutting in and out what so ever. The mini even charges in the inMotion just like the larger iPods. So far it seems to work perfectly!
I will try and post some pictures later...