Since 3.0.2 shadowbox.js is out hopefully they are working on their new version getting the IE6 issue fixed. Unfortunately there are still IE6 users out there.
Other than this issue, I like the ease of use and the inline override/configuration options. This is the first shadowbox plugin that allowed me to 'drag' a very large picture rather than shrinking it making it unreadable. Can't wait to the GA version (but it need to work with all browsers)!!
Upgraded to v3.0.3 which should fix IE6 problems.