A Note About the New 2010 DVD Release by Disney
Recently, Disney has reissued KIKI'S DELIVERY SERVICE along with MY NEIGHBOR TOTORO, CASTLE IN THE SKY, and PONYO. This new release has a lot more extras than its previous counterpart, mainly in the way of interviews with Miyazaki, and even the whole "interactive" WORLD OF GHIBLI map.
However...
If you happen to be a fan of Disney's dub as it was released on video in 1998 and on DVD in 2003, a warning should be made: the English version has been modified.
When Disney dubbed the film back in 1997, there were quite a lot of extra lines, mostly in the way of Phil Hartman's Jiji, who adlibbed most of his dialogue, to good effect IMO. All those extra lines are gone in this new version, and so are the occasional embellishments to Joe Hisaishi's musical score. Even the Sydney Forest songs which serve as the OP and ED theme have been reverted to the Japanese originals. While this brings the dub closer to the Japanese version, it may cause controversy for people who grew up on it. Probably the only change I would agree with is the removal of Jiji's last line in the film ("Kiki, can you hear me?", as it was added in at the end), and some parts of the embellished score contributed by Paul Chihara, if not all of it, but otherwise, I would hardly change an already delightful dub just to appeal to the purists who never liked it in the first place and probably won't even watch said dub anyway.
Whether it's worth double-dipping for the extras is up to the customer.