Thanks for all the input...
An NPC-Generator is already in development, at the moment I was thinking along the lines of Templates, for example: Choose Template "Gang", choose Professionality "2", choose Count "5" and it will generate five apropriate npcs (from the template) who can be transfered into the NPC manager or the combat tracker with one click.
Adding names sounds like a good idea, random statistics (height, weight, "lisps", "stinks", etc.) aren't really "my" thing (I tend to improvise here), but could be generated from a list, too. With an apropriate template, let's say "Norm" you could also generate simple NPCs on the fly, but I tend to work out more important npcs myself.
The main "problem" I see here is to make the whole thing usable very quickly, because I would hate having to click around for a minute before being able to say "His name is Jimmy and he's fat." :-)
A calendar plugin sounds like a nice idea, but nothing that's on my list in the near future, but the whole thing is Open Source and it will be pretty easy to develop plugins, if you know Java, of course, so there's always a (small) change that someone else will write it :-)
Testing on other platforms would be pretty nice, but I'm optimistic, as I don't use any platform-dependent libraries for the core and most of the plugins (only the video plugin will probably neet the OS-specific JMF, but this plugin is highly optional). In any way, you'll simply be able to download the latest release (or the source code) from sourceforge and test it, for which I would be really gratefull :-)