Expert Zone just posted some new articles by columnists who have been playing with evaluation Portable Media Centers including one by one of the co-developers of Quicktime for Windows.  If you're interested in more of the “How“ of Portable Media Center, check these out.

Using Windows Mobile-based Portable Media Centers and Windows Media Player 10 - Galan Bridgman

Using the New Windows Mobile-based Portable Media Centers with Windows XP - Barb Bowman

Viewing Recorded TV on a Windows Mobile-based Portable Media Center - Barb Bowman

[Editor's Note: Sorry about that, Galan's article isn't showing up correctly vs. my editor, may be time to upgrade the site again]