According to MacRumors:
Alongside today’s introduction of updated Time Capsule models, Apple appears to have finally discontinued Shake, its long-standing high-end digital compositing and visual effects software package. While Shake’s product pages remain available on Apple’s site, it is no longer listed in the online Apple Store and MacRumors has received word that Apple sales representatives have been informed of the product’s discontinuation. Shake had been priced at $499.
Shake was originally launched in 1997 as a product of Nothing Real, which was acquired by Apple in early 2002. Apple continued to update Shake over the next several years, but the release of Shake 4.1 in mid-2006 was accompanied by the announcement that no further software updates were planned. A minor update to version 4.1.1 was issued in late 2008.