Recommendations about any of the media centres listed here, or comments about them, are welcomed and should help me and others decide which media centre to use.
I have installed XBMC on a couple of Windows PCs because it is cross-platform and it works on the Windows PCs, but it would not install or uninstall properly in LM8. I looked at the XBMC threads here, but there isn't much interest in it, although I'm told by a friend it is the most mature and advanced. That's why I tried it with Linux first, but I'm not off to a great start. [edit] After a full delete and re-install, XBMC is working better.
LM's package manager has some other media centres, so my question is if there is one media centre to pick over all others? If enough good comments can be collected here, cross-platform or not, then maybe this thread can be used as a resource for people also interested in HT media centres.
If anyone knows of a comparison chart or site that reviews *cross-platform* media centres, that would be great! I'd rather start off with using the one with the best potential to improve and stay working right, without fiddling with a bunch of installations. It has to be used with non-geeks, so I only want to have to train them how to do things once. I also recognise the argument for going light and do use VLC on all computers, but that is not my purpose here.
Things I need to consider:
- use with Windows and various Linux PCs, PS3, NAS box, used mainly for playing movies (pictures, music and any other (Internet?) media may come later)
- the PC will be used mainly/mostly/only as a media centre platform, so it has to present itself and work well in this way (so program weight doesn't matter)
- the media centre needs to be current and remain in development (no dead code)
- we don't have a television service, so a PVR is not needed
Cross-platform Home Theatre Media Centres
Boxee - XBMC-based
Freevo - cross-platform (with some effort), mainly Linux oriented
GeeXBoX - XBMC-based
Moovida - Elisa-based (ver.1 only available for Linux; ver.2 coming "soon"

MythTV - multi-media server
SageTV - expensive
Swiss Center - cross-platform media centre, Internet radio and media player, and more
XBMC - multi-media server
Other Media Servers
HTMC Element - a HTMC focused Ubuntu/Xfce-based Linux distribution
Entertainer - no official web site?, for GNOME and Xfce desktops
LinuxMCE - devoted partition Kubuntu install
Sockso - cross-platform music server
Squeezebox Server - Logitech's Squeezebox cross-platform music server for their hardware players
VortexBox - Fedora-based music server / jukebox, or you can buy as an applicance
Summaries
The Linux Cauldron Top 5 Linux Media Centers, posted April 2009
XP Media Centre site Linux sub-site, posted Oct 2008
mintCast videos - mythTV
Hardware - Software - Backend
Magazine Discs With Media Centres
Ubuntu User, Issue #4 / April 2010 - comes with mythbuntu and Freevo