Here are some online resources that help academic writers, and indeed anyone needing writing instruction, go about the business of words with increased assurance.
General Style Guides
Journal Style Guides
Visual mapping of your argument - Argumentative
Convert Word documents to PDF - PDF995
Resize your images - PixResizer
Basic editing in a PDF file - Very Pdf
http://www.fas.harvard.edu/~wricntr/... - An excellent page of writing tips from the Writing Center at Harvard. The material is concise and covers basic areas of grammar, style and punctuation.
http://www.askoxford.com/betterwriting/... - The Oxford Dictionary's page on words that are often confused. A great resource.
http://www.economist.com/research/... - The Economist's style guide. Read it and watch your prose become crisp.
http://grammar.ccc.commnet.edu/... - For a grammar refresher.
http://owl.english.purdue.edu/handouts/... - Purdue's writing lab offers basic lessons in English for those who use English as a second language.