Here are the useful links.
About writing a fic :
Not LOTR specific, but help prevent Badfic.
http://www.squidge.org/~minotaur/
Yet again, it's not LOTR specific, but if you click in the corner right and up, you will find sex tips. A kind of "introduction to gay sex for female writer". Useful.
http://www.subreality.com/marysue/gsblolfc.htm
A test for Mary-Sue. It is humoristic and far from serious, but it can help you see if your fic is a Mary-Sue.
About LOTR fic (archives)
For the future
Miscellaneous :
In the future, too.
You can send me an e-mail if you want to be included. ysabel_beaulieu@yahoo.ca