Another article I read concerning the issue of Christ going down to Hell was by David Reagan:
http://www.learnthebible.org/did_christ_go_to_hell.htm
I also got across Bullinger's appendixes to his Companion Bible where he says "spirits" are never used of men in the departed state. (see
http://www.companion-bible.com/CBPdffiles/ )
I haven't figured out every detail on this issue yet, and looking forward to more discussions here.