http://www.macnn.com/articles/09/07/17/imovie.804.update/
Apple updates iMovie to version 8.0.4
updated 12:05 pm EDT, Fri July 17, 2009
iMovie 8.0.4 update
Apple today released the latest update for its iMovie software, which is said to improve overall stability and fix several small issues. iMovie 8.0.4 has fixed a problem related to video rotation that appeared while working with files create on an iPhone 3GS and an instability problem that could occur when adding multiple beat markers in some languages. An issue that could cause the software to become unresponsive after using fine-tuning controls past stabilized portions of a clip has also been fixed.
The update weighs in at 35.56MB and is available from Apple's website or through Software Update.
Forum Regular
Joined: Aug 2001
so...
This update improves overall stability and fixes a number of other minor issues.
So, I guess Apple sees stability as being a 'minor' issue?