(laughing only because you asked)
But seriously boxman, you can't see the forrest through all these dam trees!
This site is the largest repository of IR codes known to mankind. Of course they are all for pronto and various other remotes, but that is about as close as you will get for free.
10 years ago, IR codes were held close to the vest by universal remote manufacturers. Many of them shoot occasional bogus codes as sort of a signature. But the Internet has shown us how information wants to be free, or so they say.
Another resource if you have the access is Crestron or AMX. They have built their own libraries, and distribute the to thier programmers as hex libraries (I'm not a programmer for either,b ut that they way I understand it).
Most of your OEM remotes for cable boxes that have universal code sets just have the whole remote made by one of the big remote outfits like UEI (Universal Electronics)