Is there a Myth front end application that will run on a version of Windows? I'm planning on buiding a Myth front/back end box for my TV in the living room, but in the future I may want to stream content to a computer in my bedroom office running XP or a laptop running Vista.

There is not a "real" mythfrontend on windows; there is something called "mythtvplayer" which speaks the mythtv protocol and will let you watch recordings/skip commercials from a windows box, but no music/videos/scheduling that you can do with a real frontend. On the other hand, there's a script in mythtv source that will build a mac osx mythfrontend with a one line command. I have one on my macbook pro, along with parallels/boot camp XP.

Will mythtvplayer allow you to view live TV on the Windows box? That's all I need - to be able to say, watch the local news in my bedroom office while working on my computer instead of having to drop everything and run downstairs to the living room to watch it. Otherwise, I guess buying a Windows tuner like the $70 Hauppage USB would work - but I thought I could get some use out of a Myth backend/frontend in the living room.

I don't know, but I'm guessing you could watch an in progress recording... If you can, then you could use mythweb to start recording the local news in windows, and then use mythtvplayer to watch the recording a little bit delayed.

There used to be winmyth which had some frontend functionality... but I think support stopped after version .19 of myth

What about Vmware running a linux system and myth frontend? Kind of a roundabout way to go but it would probably work.

I can confirm that an in-progress recording is watchable from mythtvplayer - just checked in on some football game recordings. Mythweb for scheduling (or even a rule for "always record local news but keep only one recording") and mythtvplayer seems more elegant than a whole VMware install just to watch tv :)