For Adium issues: Please search the forums and the Trac before posting. This makes the developers very happy! Also, check out the Adium wiki, the Adium Team has tried to answer all the questions that might crop up when using Adium there.
Quite simply, we don't have many developers, and they have other things in their lives keeping them busy. Perian is a free time project, and that means it won't receive attention by developers who don't have any free time.