PDA - Pretty much all the Palm devices from the Original (US Robotics) Palm 1000, III, V, even the m125
DVDR - Just in my computer not standalone
WebTV - Nope but 100% Tivo user (Standalone and Directv)
Raspberry Pi - I have one but it mostly sits in a drawer
Internet Radio - I had a friend work at SimpleDevices that was a standalone internet player (company long gone)