From WoWWiki

I'm a developer by day, tauren hunter by night ... err actually I have been doing less hunting and more macro and add-on fiddling of late.

I've made a few simple add-ons

Dodge Ding the simplest of all add-ons.
Looks for combat messages showing that you just dodged and plays a simple sound.

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Sample Code

Sample Code Check Hunter Aspect

Sample Code Check Pet eating

Sample Code Check Hunter's Mark

List of known buff and debuff effects that can be queried

How to create a simple installer for your addon