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The HTML redirect has been used by some promoters (in the porn industry) to bye a lot of domaine and then redirect the user to the main site, when they hit the redirected site. They usually bought domainnames that were misspellings of popular sites.
The HTML refresh has been used to inflate hitcounters and banner expoesions (how the he... do you spell that).
The SE's will bann you if you use these. Use javascript if you must