XBMC streaming to remote pc?

@xbmcmentor, your "system" has a centralized DB that stores all the configurations/movies/tracks for yours 5 XBMC instances?
How can I do the same? How is called this feature in XBMC?

It is not an XBMC feature. I just use the symbolic link feature within Windows 7/vista to make a shared network folder appear as a local folder to MySQL Look here to see the background on this - http://en.wikipedia.org/wiki/Symbolic_link

The two folders are make common to all installations are userdata and addons. I also use the portable data setup as I find it is easier to manage.

So you have a set of folders in which you have userdata and addons, you use symbolic link to use always "one real" set of folder?
How can I achieve that (a portable "settings" folder)?

Here's the jist of what I do.

1. Install XBMC normally but change the install folder to something I can navigate to and manage easily, like Users\Public\XBMC (this is also required if you have more than one user account on the computer in question and any one of them might be running xbmc).
2. Edit the start menu shortcut to include the switch for using portable mode -p (I like using this because I can easily change things up by unceremoniously dumping the whole portable_data folder should I ever have the need or want to do this).
3. Navigate to the folders created at Users\Public\XBMX\portable_data and remove the userdata and addons folders
4. Drop to a cmd box and make symbolic links to "replace" these folders such as: mklink /d userdata \\server\xbmc\userdata and mklink /d addons \\server\xbmc\addons (look this up to be sure I have the syntax correct)
5. Use XBMC as usual

For this scheme to work properly, all your media HAS to be referenced identically from each installation. This is why I use "\\server" instead of mapping a drive letter directly. For instance, all movies can be accessible from all computers in the network at "\\server\movies". This way there are no drive letters to worry about and it's just cleaner. Because this is a network share, the media could actually be moved if needed and the stations and the database will be unaffected. This also enables you to distribute your movies throughout your network easily should you ever want to do this - just remember, wherever the media is stored has to be accessible at all times and in an identical way from all stations. All my media is on my server which is on 24/7.

Once this is setup for one station, additional stations can be added easily in just a few minutes and all react equally to any changes in the database. I believe I resolved to just focus on the two folders mentioned as it enabled me to do make other "station specific" settings like audio/video output types that would not have to be the same for all.

There's no rocket science to this but you do have to be comfortable with basic networking tasks and setups.

So you have an XBMC instance on each machine but e single centralized "userdata" and "addons" linked by simlink to each XBMC instance/machine; but at the end you say " it enabled me to do make other "station specific"", I don't understand. Have you got multiple userdata/addons folders or only one "real" folders set?