Get it: http://cgcookiemarkets.com/blender/all-products/animated-text/
On the video below you can see how to work with and modify few of the files in the Animated Text pack.
I'll also explain one of the key elements used to put together one of the files from the Animated Text pack. We've seen the F-Curve Noise modifier before but this time round we'll use constraints to limit the motion range. Note that you can use constaints for rotation, scale etc. Enjoy!