Calm down folks.... as C Guinn says, it is common practice for Amazon to project an availability date much farther out. Amazon will probably have this in stock before the release date and you'll get it just as fast from Amazon as anywhere else. I have already upgraded to iWork '09 (not that big an upgrade but what the heck) and iLife '09 seems to be a much better upgrade for the money.
Until they have a confirmed date and quantity of stock being received from Apple it is pretty common for Amazon to project much farther out than reality. Based on past releases I have seen, they will update the date as it gets closer.
It's nice. I really like the new features of iPhoto, Place and Faces and I like the new version of iMovie. I used the new version of iMovie for a class project and it was easy to use. I really like the new titles that Apple added, for example, Far Far Away title from the Star Wars movies.
I recommend the new version of iLife, Apple has added some great features that make the whole the suit a bargain.