I recently posted a summary of my theory of Remix at Remixtheory.net
Direct link here:
http://remixtheory.net/?p=174

The summary has been made part of the website's section "Remix Defined"
http://remixtheory.net/?page_id=3

Excerpt:
REMIX DEFINED

To understand Remix as a cultural phenomenon, we must first define it in music. A music remix, in general, is a reinterpretation of a pre-existing song, meaning that the "aura" of the original will be dominant in the remixed version. Of course some of the most challenging remixes can question this generalization. But based on its history, it can be stated that there are three types of remixes.

Read the entire entry:
http://remixtheory.net/?p=174