Does anyone know any reliable writing or grammar resources online?

There are many. Here are the ones I like best:

Grammar --
(Broken Link Removed)

http://english-zone.com

http://www.chompchomp.com/menu.htm

http://members.cox.net/teachro/

Writing --

http://www.powa.org

http://owl.english.purdue.edu/

http://leo.stcloudstate.edu/catalogue.html

http://nutsandbolts.washcoll.edu/
Use the links in the column at the left as the table of contents.

=)