CocoaBrowser, by HoshiTakanori? and MaxHorn?, is an application for browsing through HeaderDoc?-generated documentation for MacOsx's CocoaFramework. An eminently useful app for the budding OS X developer. Doesn't get InMyWay. It's definitely OnMySide, as well.
Note to users of Xcode 1.5, Xcode 2.0 and greater: You will want to use CocoaBrowser SN, updated by Satoshi Numata, available here: http://numata.aquasky.jp/programming/cocoabrowser/index_en.shtml