This is an old post, preserved for reference.
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[Update: Please see the new version which supports multiple fonts and 'medium resolution' graphics]
I've update the library used to generate 80x25 characters of text output to a TV or video monitor on and Arduino. This now uses the latest update to Grant Searles code which incorporates his 4-bit and 8-bit modes and the I2C version I had previously forked the library to add has now been rolled into the main library.