[Nicki Faulk]

“Another way to do .. parse your forum rss feed.”

Exactly what I was going to suggest. If the WP theme is widgetized, its user should have the RSS widget available, so he/she can just plug in the link to your bbPress install’s RSS feed. If not, he/she can use any number of RSS-in-sidebar plugins to accomplish this. (Or if they’re like me, do it by hand and use a plain RSS-to-PHP script.)