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I've used meta-refreshes with a 5-8 second delay for many years with no ill effects for legitimate pages, not doorways. Prominent doorways with fast redirects are very likely to get reported as spam by competitors..
What do they do to you?They may award you some type of penalty (bury the page in their rankings) or an outright ban, it varies from SE to SE. I haven't seen any recent reports.
Added a little for clarity
[edited by: DaveAtIFG at 8:21 pm (utc) on Aug. 11, 2004]