[CentOS] Building rpm-s from binaries

Hi,
We'd like to simplify deployment of new blades and I need to package some of 
proprietary libs we are using, and obviously I don't have sources for them. 
Can anybody point me into good direction how to make packages from binaries? I 
have basic knowledge about building rpms, but it seems to be source oriented.

Thanks in advance
-- 
Tomasz Napierala
System Administrator
Allegro Team
http://www.allegro.pl/