Instead of continually writing my own modules to convert systems into puppet management, I would prefer to leverage the community as much as possible. So far I have come across two sites that compile modules for distribution, Puppet Wiki and Puppet Managed. What else is out there, and/or what have you found useful?
SnapOverflow
Here's another (not sure if those are all the same content, but they look like it)
There's a goal by some to make modules "reusable" and general purpose enough that they can easily be used across many sites. My experience, however, has been that very few modules can simply be dropped in due to all sorts of assumptions. There's lots of good examples out there, though.
Also check that page http://reductivelabs.com/trac/puppet/wiki/PuppetModules .
Searching GitHub repository names for 'puppet' will find you quite a few - the standard naming for a puppet module seems to be 'puppet-{module-name}', eg puppet-apache.
This link should take you to the results.