I know what your talking about...I've noticed it a lot more lately. (I lurk a lot). I think it's like stevielynn said, the postings on the opening page have the thread titles, but don't list what forum they belong to. Then, people read and respond and most likely don't look up at the top of the page to see what forum they're responding in (ie. giving undergrad examples when CRNA school examples were asked for implicitly by being in the nurse anesthetist forum).
I feel like I"m rambling. 4 12's in the CVICU (or anywhere for that matter) will do that to a soul.
-Alyssa, RN