It's been four long weeks since Microsoft released Vista SP1 for the "fortunate five" languages (US English, French, German, Japanese, and Traditional Spanish). Now, everyone else can get updated.
Yesterday, Microsoft rolled out the "all-language" (36 language) version of Windows Vista SP1 in your choice of x86 standalone installer, x86 CD (.iso) image, x64 standalone installer, or x86/x64 "universal" DVD (.iso) image.
If you have previously downloaded the five-language installers for Vista SP1, keep this in mind: all-language installers and .iso images are known as "wave1," while the original five-language files are known as "wave0."
For more information about what Service Pack 1 adds to Vista, see my article Windows Vista SP1: What to Expect.