Drizzle magnifies the image by shifting pixels a little bit left/right/up/down to eek the last little bits of resolution out of the image. It increases the size of the image which I think makes it easier to post-process as you can see the effects more easily. After I do all the adjustments I want, I can then reduce the size back down (usually Jupiter I reduce by a third to get the planet size back down to captured size, Saturn I reduce by a half to show it at 50% larger than captured, Mars I show at 2x etc). Here is a long description of the process, all I know about it is that it can potentially improve my images (even if it's just a little bit, that's enough for me).
http://www.stark-labs.com/craig/reso...rizzle_API.pdf
It takes longer, both to stack and sharpen, but I have time ...
BTW, here is a video of Emil (creator of Autostakkert) describing the program and the latest version, AS!4 (not yet released).
https://www.youtube.com/watch?v=JIjXmRh1DE0
Andrew