Dierk is correct. The iview-multimedia site is maintained primarily due to the forum (and frankly because no one like the original Microsoft Expression forum due to its ahem limitations). Note that the new Microsoft Expression forum
is much improved from a UI standpoint, and content has been migrated over from the old forum. There is also some good (but dated) information on the iView site. We are working revising some of the more useful documents and webcasts on the iView site to bring them up to date with both Expression Media and third party products.
It is still possible to find iView MediaPro at various resellers. For the longest time it was on Amazon and I see that there's actually version of iView Media (not Pro) up there from one of the Amazon Storefronts and a bundle with another product, and yes I've also seen it in Fry's.
Today, the only official ways to get the Microsoft Expression Media for new customers are by purchasing either:
1. Expression Media standalone
2. Expression Studio, which includes Expression Media
3. Microsoft Office 2008 for Mac Special Media Edition (includes the Macintosh version of Expression Media).
There is also the 60-day trial download and the new Expression Media 2 beta, which are both available at the Microsoft Expression site