PostView and Online are also two heavily accessed tables, though both are fairly small. The Post_tree and PostNew tables might also be good candidates. If using the INTERNAL indexing scheme, converting the gforum_Post_Score_List and gforum_Post_Word_List tables might also be beneficial. I'm not sure how InnoDB tables affect _light_ traffic loads, so how much you convert would probably depend on that.
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com