Most sites that use an on-page commenting system don't bother with a forum (especially WordPress-based ones), but there is something nice about the forum.
It brings a sense of community that the on-page doesn't have.
On the subject of which... I did think about doing something neat. Since the storyline has an Agatha Christie feel, wouldn't it be neat if we could round up some more players and have a Murder Mystery of our very own? (Just a crazy thought I had while shopping. I still haven't managed to get today's comics up in WordOwl
due to buying a Christmas tree and other shopping stuff.)