PVR-350 hardware decoding support in MythTV has ended, at least for the time being. The hardware encoding is still supported.
The developers have indicated that because nobody has stepped up to support the PVR-350 decoding functionality, the support has not been included in MythTV 0.20.
Update: 12/18/2006
Daniel Kristjansson on the MythTV Mailing list has clarified this. He says "It's no longer maintained but it is still in the SVN head. It will probably be removed shortly after it completely stops working; whenever that happens."
As a PVR-350 owner, what does this mean to you? The encoding portion of this card is still supported, which basically means the card now acts like a PVR-150 or PVR-250.
If you are considering getting a PVR-350 for use with MythTV, maybe you should reconsider. A good alternative would be to get a PVR-150 along with a NVIDIA graphics card. The NVIDIA cards still have supported hardware decoding (XvMC), and can be found for about $50.
At some point, if someone picks up the development of the PVR-350 decoder, the support for it may return to MythTV.

This is nonsense. The TV-Out
This is nonsense.
The TV-Out functionality of the PVR-350 is still in MythTV 0.20, and continues to exist in the latest SVN development versions.
While it is true that nobody is currently maintaining the code specific to the PVR-350, and any problems that may occur may not be addressed in a timely manner (as there is no developer currently working with a PVR-350). This is a far cry from "the support has not been included in MythTV 0.20" as quoted above. Nothing pertaining specifically to the PVR-350 has been "removed" from MythTV.
Thanks for your feedback
I have clarified on the MythTV Mailing list exactly what the situation currently is, and have updated the page to include the comments received.
PVR-350
what remove the support then, how much space was it taking up
Its not about the space it
Its not about the space it uses its about how its too buggy to use. I bought a PVR-350 for the intention of using it for mythtv. Two years later could not get it to output tv-out. Now we have two by a gf card with tv-out and a tv card as opposed to the 1 card for all.
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MythTV | MythTV Information and Resources
MythTV | MythTV Information and Resources
MythTV | MythTV Information and Resources
MythTV | MythTV Information and Resources