Thanks to all who responded.  The most common plan from those who did
respond involved contracting out to a third party for use of a box and a
site (SunGard was frequently mentioned, and HP's Recovery Center got one
mention).

Second in response frequency was from those who already had a second
location for other reasons and used it for off-site storage of data or had a
scaled down version of their production box there for use as a backup.  A
couple of these companies were shadowing their main box onto the backup box.
One company responded that they were actually running in parallel with their
main box.

Thanks again.  If anyone would like more details, let me know.

John Lee
Vaske Computer Solutions