It is on front page of CodeGear web-site – “More then 3.2M developers use CodeGear tools worldwide“.
Is it a big number? yes.
Is is significant number? well, this is the number of developers for ALL CG tools (unique license/developer, I assume, for JBuilder, Delphi, 3rdRail, Delphi for PHP, etc – total of 11 main tools). I do not know what average distribution is right now, but I would think that we can account 1/3 for Delphi family tools.
Wow! 1M+ of us around the world.