All the magic is done with an apache filter, so your code doesn't even have to know that you are using an upload meter on the frontend.
I gave a demo of this at YAPC in Chicago and I have put my example code online, including the upload meter example.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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<blockquote> <br /> <dd>
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Want more info? How to link or
or How to display code and escape characters
are good places to start.