Have you checked out
theredalliance.com? It does a good job of one page per regional and aggregating everything (including what others are doing). Maybe a bit cluttered for your tastes but thorough. I personally try to watch every webcast live at once (some is doing instantly archiving like 987). I watch the MMS ones using multiple VLC and on my HDTV using XBMC hacked XBOX (my main one which is FL this week). I use something like MMARambotic to watch all the ustreams on a single page.