There is quite a bit of Doreamon cartoons on Youtube... some are even Subtitled in English. Unfortunately, it's by someone who you can tell English isn't his first language. One was so confusing, I think I understood it better without subtitles.
I've been watching the 2006 series so far, since those are the tapes I got from the Korean Market.
I love those tapes. They even have the commercials. They even had one with Big Bird and Elmo (singing in English with their original performers). not the Xerox one. I didn't know what it was for.