Yesterday I needed a container to manage a small number of components and although I've used Avalon in the past it's fairly heavy and intrusive and the thought of adding all the dependencies to my web app just made me a little hesitent. After looking at a few containers I decided to go with PicoContainer. An hour later it was integrated and combining my components. You can't ask for much simplier than that. Now I've read all the arguments about the use of constructors being evil blah blah blah, but this thing just works and its nice and light (44K with debug symbols).