Over the last week or so I've been updating some more of Kenny Ramage's old tutorials at AfraLISP. There are now 116 updated tutorials.
Today I just completed an AutoCAD tutorial using a (little known?) Express Tool called Rtext (Remote Text). Although I was dimly aware of this feature, I've been blown away by how potentially useful it is. Basically, you can use Rtext in combination with DIESEL strings to automatically generate dynamic text objects that react to changes in the drawing or to changes in external text files. Take a look at the tutorial for some examples.
Am I the only one for whom this is a revelation? Oh, sure, everyone else has been using this since for ever