The Craft of Research (pdf.)Booth, Wayne C.; Colomb, Gregory G. and Joseph M. Williams, University of Chicago Press, 2nd edition, 2003. Using lots of examples, this text guides you through the writing process from idea to final text.
The three-step revision process. A video made by Patrick Vogelpohl, English-teacher at Solano Community College in Fairfield, California and Chapman University, Travis Air Force Base. The video gives you some good advice on how to work with and revise your text.
Take a fun and educational test to find out if your writing is "flabby" or "fit" with The Wasteline Test. This is an online version of the test from the book The Writers Diet by Helen Sword (Pearson, 2008).