NEW YORK - E-mail is crippled, concussed by an irrepressible spam stream. Web surfing can be equally confounding, a wobbly wade through bursts of pop-ups and loudmouthed video ads. And that may explain the excitement these days over a somewhat crude but nifty software tool that automatically delivers updated information to your computer directly from your favorite Web sites. Enthusiasts see these Web feeds as sketching the outline of the next Net revolution. The technology behind them is called RSS and I rely on it daily to consult The New York Times, the BBC, CNET News, Slashdot and a few...