It is technique to reduce the server load and www4 simply means there are multiple servers.
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If you go on Youtube, you could type in, "fma chibi party [english]" or you could wach it in Japanese and read the subs at the bottom of the display. That's what I do when I watch anime!
For the first Fullmetal Alchemist anime there is only the follow up movie, Conqueror and Shambala, that concludes the storyline. For the second Fullmetal Alchemist anime, FMA: Brotherhood, there may be a movie released in 2011, though the plot isn't fully known yet and doesn't appear to be a follow-up of the series end.