I've created a tool that generates bmps or pcxs from system fonts which can easily be converted into zdoom font lumps using "imagetool" (available here - http://grafzahl.drdteam.org/index.php?page=topic&id=230 - thanks for the link, Firebrand)
I'll release the tool once i find some good hosting for it, for now here's some screen shots...
compare those images with the example images packaged with imagetool and you can see how useful this tool can be =)
So, what do you say, Janis? Can we have custom fonts?



