Leverage the HTTP ability to get headers only from the
source (to reduce bandwidth, server, client load) or to
only get the document when its changed.
Have a suggested update rate. Learn an update rate.
Run as a service so you don't have to run aggie all the
time.
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Actually, Aggie does all the things you list in the first
paragraph.
Additionally RC4 ships with a command line version called
AggieCmd that can be run as a service, though it just
overwrites the output file Aggie.html each time it is run
making it of dubious utility. When RC5 comes out and has the
ability to pipe items though e-mail then this feature will
really shine.