I'm really bad with php, but i'm done with album page theme http://photoroutine.com/routine/index.php?album=2008%2F001 (i do not need thumbnail tiles).
Now I'm needing a simple index page with textual list of sub-albums titles, (sorted by albums) and i don't know what to do, although it looks pretty easy.

Sorry if i missed the answer.

Look at the print album menu functions http://www.zenphoto.org/documentation/zenphoto/_plugins---print_album_menu.php.html

thanks!
it shows the album list depending on context, and i have no idea how to make it showing the list of sub-albums.
what i need is:

ALBUM 1
- sub-album 1.1
- sub-album 1.2

ALBUM 2
- sub-album 2.1
- sub-album 2.2

So you want that sub albums are always shown? It would be too hard to hack the current version of the album menu because it consists of heavily nested loops to achieve the contextual display. You then would have to use an older version of the menu:
http://www.zenphoto.org/trac/attachment/wiki/ZenphotoHacks/print_album_menu1.2.2.3.zip

This version does only support 1 subalbum level and does not support passwords (the new version is about to be updated for that).

exactly what i need, thank a lot!