Please select your preferred version, and use the torrent links (bottom of the page):
Official mirrors here.
I have always wondered if a place describing the status of the different official mirrors for Ubuntu repositories existed.
Well, it does :)
Aaron Whitehouse has mentioned it on the ubuntu-devel mailing list, quite an interesting page. You can find it here:
I never realized that some mirrors could be one week behind.. That is currently the case for some gutsy mirrors in France.
ubuntu-devel thread (please read down the thread)