A Lot and All RightHow to use "a lot" and "all right" correctly
Alot and alright are considered nonstandard forms. Use a lot and all right when doing anything other than very informal writing.
Common Errors in English Usage: Errors in diction and idiom commonly made by native speakers of English
List of Common Errors in English Usage (PDF): Printable version of the complete list
Common Grammar Errors: A list of common errors in grammar (topics like subject-verb agreement and parallelism) as distinct from usage