ForwardTrack

ForwardTrack is an open source tool (now entirely written in php) that allows email campaigns to be tracked and mapped as they are forwarded from person to person. This is definitely useful as it reveals the spread of information and some of the underlying social network.

Star Rating Widget

Here is a rating widget and how to use it. It can be used for collecting ratings from website visitors. Typically, it will be used for five-star rating, but you can pass it any number, so that it can be used as an n-star rating widget.