Hi ~*McoreD*~,
"You also say: I haven't found a way to refresh the album art cache, is this different to overwriting Folder.jpg (possibly via iTSfv)?"

Well I thought it would be enough to have folder.jpg file in each album directory. But it seems that VMC does not re-read the data once it's grabbed albumart. In many cases the old version is still displayed. So if you find/produce higher resolution artwork then it's kind of ignored due to the caching done by media center.

In general Media Center and WMP11 will overwrite folder.jpg with reduced versions of the artwork like 200x200pixel. I'm having my music library on the VMC PC and the folder is added to WMP11 via a read-only share like \\music\ which is then added to WMP11 to avoid the folder.jpg overwrites.

The library should auto-opdate. But it doesn't. So what I do is to go to WMP11 > Library and pretend to add a new folder. This will force WMP11 to scan for new files. I'm not sure of missing auto-update is due to my library size, I have 1.400 album and around 25.000 files.

Media Center copies found artwork to a cache and uses that for the UI. There are several artwork per album:
* the Full Album art shown when an album is playing in the center of the screen, but it could change per song I guess.
* Then you have a small Album art if you are looking at the playing queue, angain this could change per song.
* And finally you have a small Album art used when browsing your music collection, I guess this is always one picture per Album - default picture if you will.
Note: I'm not 100% sure about this, but this is what I believe

The caching is tricky as the files get a id number assigned like this: {0A1FBC31-2EDB-44B5-BE3A-565AB02059A6}.jpg.

On my HomePC i'm using WinXP and the cache is found at
C:\Documents and Settings\<user>\Local Settings\Application Data\Microsoft\Media Player\Art Cache\LocalMLS

and on the Vista PC I have it at
C:\Users\<user>\AppData\Local\Microsoft\Media Player\Cover-cache\LocalMLS

This link is pretty good about WMP and where data is stored. It's a mess.

But this is just for WMP cache, I'm not sure if Media Center is using additional cashing. There might be a good chance this is the case.

Finally I'm not sure of WMP requires a certain tag for the embedded artwork. Seems like it's possible to add several artwork files and classify them as Logo, Front, Back etc.

Software
There is AV Soft having the AV Art Fixer. But looking at the forum it doesn't seem to work all that well.

There is also MusicBridge and I saw this post yesterday
about the upcoming version 3.0, but unfortunately the programmer writes "My current plans are for an "All data" sync only, excluding artwork."

So in short if you are able to build something like SynchroClean for WMP/MediaCenter I think a ton of users would be exited.

Cya
- Chr