In a way it depends on how discrete you wish to be about your idea.
Thinking outside of the box. One kinda interesting place to find up-and-coming young hackers is to check gaming coding sites. New gaming mods and game scripting communities are often a doorway into for-profit hacking. Quality may be hard to control for, but most of the potential candidates there don't yet know they have marketable skills.
Set up a Google Blog Alert (or other blog search alert service) for the technologies you think make a good hacker. For example "python", "lisp" or "arc".
As you get new personal blog alerts on those topics, you probably could get a decent sampling of hackers talking about technology. Approaching them individually on their blogs might be something that could work out for you.
http://www.partnerup.com/
http://programmermeetdesigner.com/
In a way it depends on how discrete you wish to be about your idea.
Thinking outside of the box. One kinda interesting place to find up-and-coming young hackers is to check gaming coding sites. New gaming mods and game scripting communities are often a doorway into for-profit hacking. Quality may be hard to control for, but most of the potential candidates there don't yet know they have marketable skills.
For example:
* Eventscripts/Python scripters: http://forums.mattie.info/cs/forums/viewforum.php?f=90)
* C/Pawn developers: http://sourcemod.net
There's also major development conferences like PyCon (next week in Chicago):
http://us.pycon.org/2008/about/