Especially in the aftermath of Digg's DRM Revolt
, my personal opinion is it is not Realjock's responsibility to delete posts because they are off-topic. User-generated sites are driven by the transparency of its' designers, and provided members aren't soliciting illegal activity, posts should just be left alone.
I do agree that posts should have some limited delete functionality--obviously you don't want someone deleting a post just because they don't like the responses it got (deleting their inital post, and the entire thread attached to it), but at least allowing a member to delete his own post provided there are no replies yet--this could solve the problem of posts being placed in the wrong area when members didn't know otherwise.
Unfortunately, with the wide variety of boards available, not everyone is familiar with all the board topic options--not to mention that members might only actively look at one or two boards and miss "important" posts in the others.