Unless the talk is really important to me I don't take notes, I'm too slow and lost easily.

By the way, for live TeXing you might want to check out some tips here also

http://poisson.phc.unipi.it/~maggiolo/index.php/2008/12/how-to-take-lecture-notes-with-latex/#more-356

and perhaps even here

http://poisson.phc.unipi.it/~maggiolo/index.php/2008/12/latex-class-for-lecture-notes/