my sincerest apologize for having to shoot down some ideas:
Armstrong dominates the Tour, he does not compete in the Giro de Italia, the spring classics or otherwise. Nor does he even hold the record for most Yellow Jerseys
Merckx dominated EVERYTHING, he won 5 Tours, the Giro, the Spring Classics, the Tour of Spain. And he holds the highest record for yellow jerseys.
Armstrong is easily a great athelete, but he is not the best in the sport. Armstrong has said he might not be back for another Tour because he feels that if he did not compete in the Giro de Italia to win it, his career would be less fulfilling.
He also wants to repay some of the domestiques that helped him win the Tours by riding for them so that they maybe able to earn some victories.
For more info on Lance or the races listed
www.velonews.com
As for records, Lance is the first man to ever win 6 Tours as well as 6 Tours consecutvely. The only other man to come close was Miguel Indurain who won 5 consecutvely.
There are 4, five time winners (Armstrong not included):
Jacques Anquetil (1957, 1961-4), Eddy Merckx (1969-72, 1974, Bernard Hinault (1978-9, 1981-2, 1985), Miguel Indurain 1991-5 - only man to win five in a row other than Armstrong)
And 1, 6 time winner: Armstrong (1998-2004)