...let's link to other people's PowerPC Youtube channels! These are (more or less) PowerPC centric, though I don't vouch for the quality of each and every vid.
The iBookGuy - Not just iBooks!
The PowerPC Hub - Actually a mix of MacIntel, iOS and PowerPC.
Lmull3's Geekery Emporium - Macs and Mac clones.
ItsMyNaturalColour - The dude with the white hair.
BBISHOPPCM's World - Some really old vintage stuff.
gavinstubbs09 - A few PowerPC videos here.