Article:

After several months of silence, Microsoft last month finally revealed some
concrete information about Windows Vista Service Pack 1 (SP1), which I
translated into my Windows Vista Service Pack 1 Revealed showcase. If you
haven't read that article, please do so now: This preview, which is based
off of more recent beta code and an in-depth discussion with various people
working on SP1 at Microsoft, builds off of that article, but provides more
information and detail. Windows Vista SP1, finally, is a known quantity.

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http://www.winsupersite.com/showcase...sp1_inside.asp