> but taking something from one conference to another - even with 20%
> new material - seems odd to me.

I agree.  Seems odd to me, too.  But, what's the magic that makes it
odd?  The labeling of something a "workshop" or a "conference"?
Probably that is it.  But, if there is 30% more in a paper from a
"workshop" what makes that different from 30% more from a paper at a
"conference"?

allman