Cel from St. Paul, Minnesota writes:
Great site, great people, two thumbs up! What is the difference between Add-ons and Add-Ins. Thanks!
Cel, an Add-on often refers to a program like a tool bar or a media player flash that you can add on to your Internet browser to perform additional functions.

Add in refers to a component such as a graphics card or additional memory, that you can add to a computer to improve its capabilities. They can sometimes also be referred to as an Add-on.

Hope that clears things up.
~ Cynthia