Online Newsletter Software

I'm looking for a online newsletter solution (open source?) for our lower school teachers to use to create weekly newsletters, insert pictures, even add audio/videos. I'm trying to find a better solution than just sending pictures in an email or a word
document. Has to be relatively easy- point/click/insert- Any ideas?

Bryan M. Berretta
Assistant Director of Technology
Lausanne Collegiate School - Memphis, TN
http://www.lausanneschool.com
Phone: 901.474.1049
SKYPE: bberretta
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Laptop Institute - July 12th-14th, 2009
http://www.laptopinstitute.com
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