Common Errors in English
http://www.wsu.edu/~brians/errors/

Do you know the difference between affect and effect? Or compliment and complement? This site can tell you as well as some commonly misspelled words. It also discusses some non-errors such as split infinitives and ending a sentence with a preposition.

Researchpaper.com
http://www.researchpaper.com

Do you need advice about writing a research paper? This is the site for you. You will find ideas for paper topics, writing tips, and advice on how to structure your research.