Other
Technical Writing: The Conjunction Or
Intended as a grammar reference for electrical engineers, this site addresses many of the technical issues of writing, including distinguishing between the inclusive and exclusive definitions of "or."
Washington State University
Washington State University: Common Errors in English: Non Errors
Among the other grammar myths that Paul Brians, an English instructor, attempts to dispel is the notion that you cannot begin a sentence with a conjunction. The site discusses other common usages and misusages.