On Wed, 05 Jan 2011 11:54:04 -0500, Tony Miklos
wrote:

OK, generally speaking, should I sand with or across the joints?


Rent one of these and connect it to your shop-vac. Works like a
charm, especially if you have a lot of ceiling work. If you have just
one ceiling, then pass and do it the conventional way - extension
pole.

_Porter-Cable 7800 4.7 Amp Drywall Sander with 13-Foot Hose_

Pic:

http://www.amazon.com/Porter-Cable-7.../dp/B00002267Z


I'm using a 100 watt flood light with all other lights turned off and
holding it up against the ceiling so it shines across the ceiling. That
makes the imperfections stand out!