I think merging Forecast and Nowcast threads would be a good idea, and probably would get my biggest vote in regards to change. I also don't like the idea of having to sift through a ton of people's stuff to find reports.
Thus my vote would be as follows...
1. FCST/NOW (speaks for itself, same as current stuff)
2. DISC (random junk from random folks relating to the event)
3. REPORTS (first hand accounts ONLY, if you were not there, you won't be here)
While I think the FCST/NOW has its place, its probably on the bottom in regards to people going back and looking things up. And since its pretty chronological, it should be easy to go back and find things in this thread.
DISC threads I've never really been for given the type of forum we have, but seeing as we cater to everyone that can spell weather, its become a good buffer to have for generic post, but at the same time, also allows for meaningful posts related to the event that may not fit into the other area.
REPORTS should be left to those who were out chasing. I do not want to sift through mounds of discussion posts to find who saw what. I think allowing first hand reporters to post more than once (i.e. the initial this that, and the other, then post later with a link to their website report, video posts, etc). Some people do not have the luxury of being able to throw a complete log up right away, and it sucks to come back two weeks later to post a report on a day long since passed.
Maybe even the first post in a report thread be a link post (like the blog thread) where chasers can post links to their logs thus making it very easy to find and bookmark reports from that event. Perhaps if that's done, you may ease some of the pain of sifting if you choose to merge reports with other garbage.
My lengthy two cents...