... such as (sorry I can't get to edit my previous post)
## mediaTomb (you'll have to tweak it to get Samsung TV to recognize MKV)
Good : only conf to modify + free
Bad : does not have chapters / subtitle menus / Bookmark
## twonky suite
Good : transcoding (even if our TV handle most of media format)
Bad : not free
## miniDLNA
Good : free + have chapters / subtitle menus / Bookmark
Bad : have to patch it.
For those who are interrested you can follow this thread : http://sourceforge.net/projects/minidlna/forums/forum/879957/topic/3708596/index/page/1
Personnaly I used this patch version of miniDLNA and it gives me complete satisfaction.
Dears Sausung fans
PC Share Manager is ok but you have to leave your PC on to use it !
To solve this I bought a NAS device : external HDD who can runs from itself. Mine is a DLink DNS-323 running on Linux.
There's a lots of different package you can install on it which kind of act such as

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic