> Is there anything similar into NetBSD kernel?

printf(), possibly with a serial console enabled..

> Sushi was a little utility which (at system up and running) did catch
> the data sent to the serial port (i.e. KPrintF output) and did print
> them to a (CON:) window.
> Such a thing would be very useful to continue using KPrintF also after
> the booting process without using a serial terminal.
> Again, is there anything similar into NetBSD?

xconsole or xterm -C will do this if you're running X..

						- Bill