One of the tasks on the table for this summer is to setup a mechanism to accept financial donations / contributions from people. If you want to contribute towards specific people's efforts - I am sure most of the guys have amazon wish lists etc in place.
Don't forget about us "little guys!" Centos/RHEL also build on upstream projects which would be happy to take donations until the CentOS donation system is ironed out.
For example: http://www.apache.org/foundation/sponsorship.html http://openvas.org/professional-services.html (FOSS security auditing software) -- commission us to write new documentation or new features [*] http://www.lighttpd.net/thank-you (lighttpd web server) https://my.fsf.org/donate/ (GNU/FSF)
[*] Due notice, this is a project I am an active developer for.