I'm going to sound very snooty as I say this, but I live in the United Kingdom. I can watch them in high-quality direct from the BBC website. :) :) :)

However, if you don't mind middling quality, you can also stream them here (http://watch-series.com/serie/doctor_who).

And here (http://hotfile.com/dl/37265592/45fab4d/doctor_who_2005.5.02.the_beast_below.hdtv_xvid-fov.avi.html) is a link to download 5x02 "The Beast Below" that I found...no similar one for 5x01 "The Eleventh Hour" at the mo, which is a shame since I liked that one better.