I have a TiVo that's on my wireless network. Occasionally, I use it to listen to the music that lives on my iMac as I cook or what have you. It's known that music purchased from the iTunes store won't play via TiVo, and I was hoping that the DRM-free iTunes Plus upgrade would change that.
TiVo still sees them as "format Purchased AAC audio file not mp3 or convertible to mp3." Luckily, The Apple Blog has a workaround. Simply convert your iTunes Plus tracks to either AAC or Mp3, and the file type in iTunes will be changed to "AAC audio file" or "MPEG audio file" respectively. TiVo likes that.
Yes, this will result in quality loss, but my television speakers hardly do the music justice in the first place, so who cares?