Here is an HTML version of the po4a's manpages.
The po4a.7 manpage provides an introduction to po4a.
For more details, the index provides the documentation of the various commands and modules.
We can help you to set up a translation framework for your project's documentation or to adapt po4a to your needs. Do not hesitate to contact us on our mailing list or on IRC (#po4a on oftc).