It's amazing the complexity and tearing-out-of-hair involved in taking over a phpBB forum and migrating it to Drupal. Not only is there the braindeadness of phpBB to deal with, but a wealth of interesting libel, and the most wonderful of user protests. Aside from the previous administrator's efforts to cover up his own inaction, and a 'healthy userbase' of spammers, the issue with user education has been most enlightening.

I spend several hours writing help pages detailing how to change the site's theme to one that doesn't cause problems on 20-year old computers, and explaining the differences between forums and groups. I make a nice little help link in the navigation bar, and I make the pages stick to the top of the front page. 2 days later I find that most of the users have /forum bookmarked because the previous homepage hadn't changed in a year, and previous /help links had been dismissive at best. It gets more entertaining looking through the logs to see who has visited the demo site, which ran for several months before deployment. I'm sure you can guess how many of the complaining hordes had visited the site.