Orb does for sure. It will transcode based on the available bandwidth. It also lets you pick what it transcodes to while you're accessing it remotes. It will do, real, asx, 3gp, or flash. Real works best with the tablets, but for some reason not all files work right. Flash is most compatible with all files, but is jerky on the tablets.

Orb is actually quite impressive. I suggest you give it a try.