Some more progress has been made to the subtitle finder.
It looks for subtitles files in opensubtitles.org. The search is not done based on the file's name but on a hash which is calculated from the file, so it doesn't matter if you renamed the file, it will find the right subtitles for the file.
The subtitles are now automatically loaded in SMPlayer after they are downloaded. No more restarting.
http://smplayer.berlios.de/forums/viewtopic.php?id=606
It's in svn r1997 via the FTP
And the Windows compilation method has changed.
The possibility to download subtitles in zip format and uncompress them (added in r1989), makes a little bit more complicated to build smplayer on Windows.
Now it's necessary to compile zlib first. This is how: