sorry to let that drag catboy. Umm...it doesn't really matter.
I suppose it would be "better" coding to use & amp;, but then really...the meta tags don't show up anywhere, so you could use "&" too.
Yahoo uses (or used, I haven't checked lately) "& copy;" to state their copyright in their meta description.
In a nutshell, it dosnea matter.
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-david
www.antipopculture.org