astrotabletalk has just done two outstanding bits on the significance of pluto in cap for all the signs (and a great one on the "death ray black hole today);
a truly great astrologer, Bill Herbst, has been having some health issues and is offline for a bit. his articles are archived, however, and you might want to go visit;
lynn hayes has some great historical stuff on pluto's previous forays into cap here;
and here is a nice little bit on today's shift of the nodal axis into leo/aquarius from tom jacobs.