phpBB™ is now in its third major version. Version 3.0 incorporates a professional-quality modular design, high security, multiple-language interface, support for a multitude of database servers and complete layout customisation, all with a low execution overhead.

For a list of all updated things, check out official phpBB site at
http://area51.phpbb.com/docs/features.html

phpBB Resources for the 3th version are organized in two categories. From those categories, one is for Mods and the other for Styles.