I haven't had the time to test it out yet (because it bases itself upon a program that refuses to work for me), but the most awesome mod I came accross is thu'umic: http://www.skyrimnexus.com/downloads/file.php?id=3251 Basically you can use shouts by just screaming in your microphone. However, it needs to have dragonscript installed and VAC. The latter is highly annoying to install, so I haven't tried it yet. Instead, here's a video of it in action:
[youtube]http://www.youtube.com/watch?v=r2gVZpaE1Ks[/youtube]
Note: lag has been reduced a bit according to the author since V0.2
A very small but funny mod is a laugh track, that plays if you fail at certain things: http://www.skyrimnexus.com/downloads/file.php?id=1632 Highly amusing and it's easy to install/un-install