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A Xoops-SMF bridge will be released from Simple Machines at the same time as the release of SMF 1.1 RC2.
It will require no hacks to the core files of either XOOPS nor SMF.
You may test the sample of the integration module here:
http://www.everything-science.com/devtesting/xoops/html/modules/smf/
Thanks to the devs of XOOPS for making third-party module development fairly easy and painless. Good work. This is a great CMS.