First of all, I want to thank you all for your replies. I'd like to answer to your question individually:
@Sajt: Perfect!
@leileilol: it's a pity that there's not a concentration of quake c programmers in Italy

! Seriously, it's not a shame for me to pay a professionist for its work. Of course I'm not a "Steve Jobs" clone, so I don't have a lot of money, but I think that the sense of this initatiative is to give programmers an input to be creative.
@mh: Of course. The first post was just a presentation. The two changes are very important to me are:
1 addition of a GPL physics engine inside Darkplaces (ODE, or Bullet). At Nexuiz/Xonotic forums they made a little test, but isn't useful for production. This change should allow artist to create models (.dpm,.iqm,etc) with bone mass linking, so it could be possible to add ragdolls and realistic (or similar

) physics to characters and map objects.
2 recreation (programmer could also use old quake monster code) of a series of monster animation codes. What I mean: if you want to create a brand new monster in quake, maybe you use old quake code. But this code uses .mdl for model format (whic is ugly) and $frame1 $frame2.. for frames enumeration (which is terrible). Nexuiz uses a better system(based on a lot of funcions that I didn't understand well) but isn't still the top. I was thinking about something similar to Roland Pluss's DragEngine Locomotion system (if you didn't know it, check it on youtube), which is supposed to be GPL in the future (I don't know the release date, though). Whith locomotion system, character points to a target but
its legs are separated from torso (NOT like md3, better!

)and is VERY cool and realistic to see.
3 a very neat game AI (story planning, events/ decisions, and so on)integration inside Netradiant. Something similar Unreal Kismet. I know, I know, for creating Unreal Kismet Epic paid maybe 20 programmers for 5 years, so I can't ask a work like that. Anyway just think about it!
4 (this is important) Add integration for cameras into Darkplaces, so it will be possible, in NetRadiant, to set that, when a player hit a "camera box", the game freezes and starts an ingame video with cameras, animation, dialogs and so on (just like doom 3)
@Urre: well, infact it was not intended at first to be a paid work!
But, I realize that everyone has its job, its university studies, etc. so it very difficult to find some spare time. This could be an extra incentive for all of us
@r00k: sounds great to me!
Sorry for the VERY long post but I wanted to explain what I was thinking!