After long pause in development of Universal Extractor version 1.6 final was released today. Read my review post here and brief version is that it is excellent program for unpacking numerous archive and installer formats .
Plenty of fixes and updates, unpacks more formats and full Vista support. I am not usually excited about software updates but this one totally made my day. :)
Home&download page http://legroom.net/software/uniextract
Changelog http://legroom.net/files/software/uniextract_changelog.txt