mhm... for me symlinking was a bit nasty...
i moved /usr/share/hildon-welcome/media to /opt/media.

i tried linking it with full paths in the command:
the media folder again showed up in /usr/share/hildon-welcome but when i wanted to enter it threw an error (don't remember it but something like "no such directory/file"!?)

so i played around in linking different folders and only the videos with full paths... didn't work at all...

then i did:
and BAM it worked?! o.O

the same issue appeared when trying to symlink my pidgin logs from ~/MyDocs/pidgin/logs to ~/.purple/logs for easy synchronization via mass storage mode. full path didn't work. i had to cd to ~/.purple first.... ^^