Like for example:
<label>$LOCALIZE - $INFO[ListItem.TVShowTitle]</label>
<visible>container.content(episodes) | container.content(seasons)</visible>
I make use of this a lot in my skin, as does PM3 and probably other skins as well.
This however is not possible in all situations. There's no conditional visibility for genres and years for example. So the only thing you could do is fall back to a label that just indicates Videos-Library, which makes it inconsistent plus you have to use a lot of conditions for this. Thanks to the PluginName infolabel this has already improved, I was wondering if the other categories could be added as well.
This would also open up new navigation possibilities by creating a "breadcrumb bar". This could be used to create the Elisa mediacenter clone which was requested here: http://forum.xbmc.org/showthread.php?tid=26806 , should someone decide to pick this up. I believe the Centerstage project uses a similar approach (although it may be that these are just indicators and not real navigation buttons. In which case, I feel they should be
Anyway, just some thoughts, I hope I've made it clear enough.