Will an APU play 3D movies?

Yes it can but you need 3d capable viewing software, a 3d capable tv/monitor, and what ever viewing hardware is needed (glasses, etc)

You should not have an issue with the Trinity or Llano APUs.

I believe it is OEM choice whether to enable the function on the Brazos I/II APUs. Brazos may still struggle in Silverlight but it's getting better.

Be sure to have the latest AMD Media Codec (Avivo) package.

That's what I thought. Software, tv, etc. is not an issue, just making sure because i had read on a few places that they couldn't handle it. I assumed even a Trinity A4 could quite easily, but I wanted to make sure before I tried.