Total, leaving aside the caps, thirty or so. Forty if we fill in the missing tiles. Can we rustle up thirty more visually different characters? I'm sure we can... anyone have a handy list of what writing systems we've used so far?
Here is a list of writing systems:
http://en.wikipedia.org/wiki/List_of_writing_systems
And we can surely ignore writing systems that would never make to our projects (egypt hierographs and other dead languages), so in total, it is not so much
Ting