Sweet.
Should work in Linux too.
It assumes you're using UTF-8 encoding for input, doesn't it? But that's the best choice anyway.

Anahata

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Sorry, but the clipboard interface is specific to Macs. It should be simple to create a Linux or Windows version, if one knows the appropriate code for grabbing and putting clipboard text on those platforms. In the meantime, however, I've created a Java version which is cross-platform; see this thread:
HtmlEsc.java

-Artful Codger-