Good stuff! Now all I need to do is convince my lab to install SVN so that I can play around with it....
One thing you might consider is sending the email only on failure; successful builds succeed quietly. I've played around with a few "email-a-day" scripts (mostly of my own devising), and I find that even at such a low frequency, after a few weeks of the same (or similar) messages I tend to delete them unread. Parsing the tests' output might be more effort than it's worth; can you simply assume that the build succeeded if $stderr is empty?
Shameless self-promotion: there's a good discussion of when to log and notify in the replies to Defensive Programming and Audit Trails.
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Found a typo in this node? /msg me
% man 3 strfry