A good site to watch the old episodes is dailymotion.com; I don't know if all the episodes are there, though.
OH MY GOODNESS YES I LOVE THE SHOW!! It's incredible and amazing and wibbly wobbly timey wimey! Love that show. And David Tennant. <3 My fave companion is Rose, and tied for second are Amy and Rory. Unfortunately, I'll have to wait a long time for season 7 since I don't get BBC America.
Netflix is good too. It has seasons 1-6 of the new for instant streaming, and most, if not all of the old series.
I have never seen an episode of Dr. Who. Please don't smack me, Vee.
I have never seen an episode of Dr. Who. Please don't smack me, Vee.