I know I suggested this in my templates thread but I think it's very important and wouldn't be too hard to add (I don't think I can really release my template as a working version without this either)
Just for HTML output would be nice if you escaped the characters I noticed u seem to do this for XML output (not entirely sure), so I don't imagine it would take alot of work.
Characters that would be nice to be done
the two quotation marks (" ')
newline to <br>
they're the only two I can think of at the moment