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ost_uid0]Just to weigh in, I like the hyphen. I think it looks better, and also the site has the hypen whenever it uses the term Five-Minute.
five-minute.com is a fine domain name (and what I voted for), and in general .coms are the most frequently thought of top-level domains. However, technically, .com stands for commerical sites, which 5MV isn't. .org stands for non-profit sites, which 5MV is. Some part of me wants to say that you should get five-minute.org instead.
Of course, nobody really follows the rules regarding .com, .net, and .org so it's not a big deal.[/color
ost_uid0]