This Monday was no more kind to investors than the last one.  Just about everything's down today - and by quite a bit - and although it's now a bit more disconcerting than comforting, the driving factor is once again pretty hard to pin down. Here's the usual summary for you first: the Dow went down by 187.13 points, or 2.13 percent, which counts as its biggest loss since April 20th.  The Nasdaq dropped by 42.42 points, or 2.28 percent.  Finally, ...