Customized Linux Message Notification, I Wish I Had

After writing an alias that shows me what's currently going on in my system (tail -f /var/log/..., ~/.xsession-errors, ...) I've wondered:

A. Why the information is not all going through syslog (almost is, but not e.g. the users errors).

B. And more importantly: Why isn't there a nice interface to syslog that shows me what I want to know, e.g. as a plasma applet for kde4, configurable but with low resource consumption nice&pretty on my wallpaper?

That'd be nice, wouldn' it? Maybe I'll write that myself one day...