There is a web page (which you may be reading now) at http://oprofile.sf.net/.

You can download a source tarball or get anonymous CVS at the sourceforge page, http://sf.net/projects/oprofile/.

There is a low-traffic OProfile-specific mailing list, details at http://sf.net/mail/?group_id=16191.

There is a bug tracker for OProfile at SourceForge, http://sf.net/tracker/?group_id=16191&atid=116191.

Several OProfile developers and users sometimes hang out on channel #oprofile on the OFTC network.