[HelliH]

Thank you for pointing me to that fantastic feature! For the last 4 days I simply didn't see it (had a lot to read...)!

I transferred some more books to the nook with calibre and had my problems with the "Show", too.

First impression: Be careful when using "Author" + any tag, both will sum up.
Second: Those unknown tags shown in the list are "series". In the beginning it's a little confusing, but once you know, it's helpful.

HTH,

HelliH

BTW: As of yesterday, calibre is at version 0.7.6 - and getting better and better, thank you, Kovid Goyal!