This is a modification of EZComments that uses your PNphpBB2 look and feel, avatars, private messaging and im/web buttons as well as allowing you to edit, preview, use the "Add Smilies" phpBB2 window and use "Quote Selected" from PNphpBB2.

Requirements

PostNuke - a recent version that supports hooks
PostNuke module that supports hooks - recent News modules do, for instance
PNphpBB2 - NOTE: only tested with PNphpBB2 v1.1a. Should work with the most recent, however.

Notes

Themes - The mod should take your forums default theme, however the HTML templates are located in the directory pntemplates. Specifically default.htm for viewing comments and editform.htm for editing/previewing a comment. I have tweaked them for GWJ.com and make no guarantee they'll work with anybody else's theme, or even the default theme for that matter :) GWJ.com's forum theme is a modified subSilver theme.
Untested - This hasn't been tested on anybody elses site, with any other version of PNphpBB2 or anyone else's theme. Use at your own risk! Just a friendly warning.

BBCode

The download page also has an updated bbcode module that handles text size, color and quotes with names.