Orb works perfectly with my TP2 using TCPMP and the Winamp stream option in Orb. Audio, Video, and TV works well. Here is the steps I used to get it working:
1. Use the "recomp-03" TCPMP
here (or just google TCPMP-0.72RC1-ARM-PPC-recomp-03).
2. Download "WM5 WMV9 Codecs.zip"
here and put the two .dll files into the Windows directory on your TP2.
(maybe soft reset at this point? i can't remember)
3. In TCPMP, under the DirectDraw settings make sure "Use blitting instead of overlay" is checked. Under file association settings make sure PLS is checked.
4. In Orb, go into settings and change stream to use Winamp (.pls).
You may need to tweak the manual A/V offset under advanced settings in TCPMP if it is out of sync.