1. You may not recommend your own fic (there's already a thread for that).
2. Follow this format:
Title (and remember to link to the story

Author
Fandom(s)
Characters/ratings/warnings
Summary/Why you are recommending it/Why others should read it ("because I said so" doesn't quite cut it.)
3. You may post 5 recommendations in your first post and up to 3 in every post after.
4. 1 post of recommendations per day. Do not spam the thread.
5. Read the previous recommendations and try not to rec the same story/stories over and over again. (If you liked it that much, I'm sure the author would love your comments.

Rules subject to change depending on how the thread goes.
Happy reading!

ETA: Guide to Ratings, for anyone who's as confused as I am. Much thanks to everyone who PM'ed me!

These are the ones that fanfiction.net uses: http://www.fictionratings.com/guide.php
Others may follow movie or TV ratings:
http://www.mpaa.org/FlmRat_Ratings.asp
http://www.tvguidelines.org/ratings.asp
Some use these terms, which seem to be found more in certain pockets of fandom than others: http://littlecalamity.tripod.com/Text/Dictionary.html
These are just guidelines. I personally don't care what you use, so long as you warn with something (that most people will understand) when necessary.