Dave Winer provided this link to an article posted by Dave Luebbert. Dave Luebbert was the development manager for Mac Word 5.0, and was my first boss at Microsoft.
Dave (L) is an incredible guy. He's a musician, and a very big fan of Jazz. He's been working on a music composition program (Song Trellis) for as long as I can remember.
I learned a lot from Dave, not all of it related to developing software. You can, too, if you follow the link above. I highly recommend his article.
As for which "Dave" is "Big Dave"? Well, Dave L is no small guy. We had another Dave who worked on the Mac Word 5.0 project. He wasn't a little guy either, but Dave L still got the moniker "Bid Dave." I suppose one could say that Dave Winer is "big" in many ways, but Dave L will always be "Big Dave" to me.
Currently playing in iTunes: Famous Alto Break by Charlie Parker