I'd love to see the ban reason (on /bans.php) added to the profile of a banned user, so somebody can quickly see at a glance what they were banned for. I'm not sure if others think this would be a good idea, but I think that if its implementation is viable, it would be extremely useful.
Philly replied to the thread, however, ignored the suggestion regarding the ban reason on profile plugin. I'm glad this thread is getting a lot more positive feedback than mine. I would love to see it implemented.
It can help clear up why people that weren't banned in the last 72 hours or so were banned. I can't see any real negatives that could accompany its implementation.