I have beta-d in the past and I would love to beta again. I have more free time now, so I should be able to have a quick turn around on fics.
A little about my beta-ing style: When I beta for someone, I make corrections or recommendations in color, save the document, and then return it to the author. If you like the changes, you can easily change the color to black, and if you don't like my suggestions, they are easily undone. Either way my feelings aren't hurt. :)
I also like to use Google Docs, as I can make comments and/or make changes on the document and then you can go into the history and see what I changed.
Please don't take my advise as criticism but at a recommendation. It is after all, your fic.
Any questions, feel free to PM me. :)
Thanks for your consideration,
:D Doink Doink