Fandango reports that, as of 10AM this morning, Disney/Pixar’s Up continues to lead with 44% of all online ticket sales and should enjoy a strong second weekend. Warner Bros’ The Hangover opening Friday is gaining momentum, now representing 21% of all online ticket sales. Holdover Night At The Museum: Battle Of The Smithsonium is scooping up 9%. Advance tickets for Harry Potter And The Half-Blood Prince (opening July 15) are selling 6% of all online tickets — the same amount as Universal’s Land Of The Lost in theaters Friday.