If you are interested in proofreading and have a high school education or the equivalent–good at spelling, punctuation, grammar and skill in finding errors, you could apply to become a proofreader for ProofreadNow.com.
ProofreadNow.com require that you have reliable Internet connectivity and up-to-date software tools. Occasionally, they seek Spanish, Russian, Japanese, and Chinese proofreaders. Keep posted to their site for further information on hiring details.
Transcription companies may also hire proofreaders. Check out my post Transcription Jobs on 02-05-09 for a list of transcription companies.