I installed PL/SQL dev inside a basic "winetools" environment (http://www.von-thadden.de/Joachim/WineTools/).
Thus, I downloaded a few fonts before doing the actual install. (this is explained and is standard in WineTools).
Then the install went smoothly.
At first launch you have to uncheck the box in "Preferences"=>"Appearance"=>"Faded disabled colors" and restart PL/SQL dev.
Finally there are a few issues which makes the experience a bit worse than on native Windows (such as copy/paste not working everywhere) but it is nevertheless very usable.
what a pity - the plsqq is the last thing that holds me from switching completely to Linux...
Aren't you, guys, developing it in Delphi ? If so, should not it be relatively easy to compile for linux... ? I know it's easier to say than to do , but why not give it a shoot ? Please