Enable Steam games to share just the latest version of Direct X rather than have individual copies for most games. (Steam users will know what I'm talking about). :)

Virtually every game that requires Direct X installed via Steam installs it's own copy of Direct X, resulting in hundreds of copies (in my case because I have around 1500 Steam games). If this software was able to enable me to just hgave one copy installed I'd be purchasing this software and all its updates. :)