Not sure, I'll be checking www.skyandtelescope.com in the next few weeks to see if they run anything about it. They have a GREAT interactive Java nighttime sky map I use whenever I take out my LX-90. Check it out, you will probably find it useful.
Thanks for the help, I will bookmark the site.
Observers in the far west of North America get lucky. Tempel 1 (just 3.5° northeast of Spica) will be in the southwestern sky, though getting rather low. The farther southwest you are the better. The comet will be in a fully dark sky 25° above the horizon for Los Angeles and San Francisco, and 22° up for Tucson. There will be no Moon. Seattle and Hawaii will be in evening twilight; the comet may be invisible from there during impact, depending on the exact timing.