The No Blackout Dates URL, http://www.marriott.com/rewards/no-blackout-dates that is posted in Ed French's message, Welcome to our 2009 Program Changes forum! triggers a General Error at Marriott.com using Firefox and Internet Explorer. Is anyone else experiencing this?
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To directly answer the OP's quesiton, yes I am exepriencing this.
To answer what I am guessing may be an underlying quesiton:
While the link you referenced may not work you can find the information on No Blackout Dates at this link:
This link is also accessable on marriott.com by clicking on the No Blackout Dates heading on the Marriott Rewards | Use Marriott Rewards Points page.