Tim, I (hangs head in shame) still haven't learned blocks in TCAD; I used them all the time in DesignCAD, but at first glance, they were a lot more complicated here, so Groups did the job easily. And I've never used XREFs. I think XREFs might actually be awesome for the kind of work I do most. Can you control the insertion point of an XREF?
And Henry, well, yup, that's the way I've been doing it. It's just that usually things load into the next zipcode, and it's a lot of zoomin'...does work though.