You can just "have it" or register a new extension. Since we have to type the extension every time if wanting to text via TEXTMARK, DWr or similar might prove more efficient.
To have output show on a joomla site, you don't need a widget. I just passed the RSS feed thru mod_slick_rss in joomla and customized the CSS of the mod to make it look pretty.
http://lite.textmarks.com/rss2/DOWNWINDER
right now slick is letting me down though. It won't ignore title and only post the description. It's reading, parsing and displaying everything. Gonna have to use Yahoo Pipes to filter the RSS feed prior to entering slick_RSS I guess.