The Writing Center @ The University of Wisconsin - Madison
The Writer's Handbook
An Editing Checklist

12. Misspellings

Spelling errors are usually perceived as a reflection of the writer's careless attitude toward the whole project.

Don't allow your hard work to be marred in this way!

In addition to comprehensive dictionaries, you may want to use electronic spell checks, spelling dictionaries, and lists of frequently misspelled words found in handbooks.