Please help me find good writing sites and good writing communities?

OneLook compares a word to many different dictionaries.

Citation Machine helps you to properly create citations in both MLA and APA.

Blogs on writing about business, technology and marketing.

Fanfiction.net is like fictionpress, but for fan fiction. Fan fiction is fiction written about characters and worlds created by published authors. Writing fan fiction is a good way to help improve your writing style, as you don't have to worry about thinking up characters and setting; all you need is a story and writing.

Fictionpress is a website that allows you to submit your own original fiction and poetry, and allows other authors to read it, rate it, and review it. This is a good way to get your starting works read by others, and get ideas on how to improve. You can also return the favour by reading other authors, and reviewing for them.