Hurricane Earl IV

Xeni posted a great NASA image of the 2010 Hurricane Earl earlier this afternoon, which got me hunting around for some information on Hurricane Earls past. After all, this is not the first Earl. There've been three others, as well as some lesser Tropical Storms of the same name. The naming lists for these things are used again every seven years, and individual names are only retired after they've been attached to a particularly damaging storm. Earl, so far, has not.
When the names do get retired, replacing them isn't easy. According to Time magazine, there's a whole list of types of names that aren't allowed. Over the years, the meteorologists in charge of naming have resorted to flipping through the weirder end of baby name books and adding friends' names to the list.
Time: How are hurricanes and tropical storms named?
Above: Hurricanes Earl and Danielle in their 1998 incarnations.