29. Total Eclipse of the Moon: evening of 20 February 2008.
The map (to the right) is from NASA and shows where and where not the eclipse will be visible. The area in the center of the map will be able (if weather allows) to see the complete eclipse. The lines to the east and west show areas that will see limited beginning and ends to the eclipse, while the dark grey shading will not be able to see anything from this eclipse.
How does an eclipse work?
Short answer: the earth gets between the sun and the moon. This graphic (to the left) is from MrEclipse.com and shows the rough geometry (not to scale) of how the planetary bodies line up during an eclipse. Go to MrEclipse's page to find a plethora of information on eclipses.
This is the last eclipse of the moon going completely dark for two and a half years, the next total eclipse will be in December 2010!
What time to look outside?
This graphic (to the right) is also from NASA and shows times in Eastern Standard Time (EST). So let me put them into Central Standard Time (CST) for my timezone:
Partial eclipse begins: 7:43p
Total eclipse begins at: 9:01p Total eclipse ends at: 9:51p
Partial eclipse ends at: 11:09p
Moon rise, across northern Wisconsin, is around 5:20p and the moon sets at 6:49a the next morning. To find moon rise/set times for other locations, the US Navy's AAD site.
How does an eclipse work? 
What time to look outside?