I am a huge fan of semi-colons. They are useful for separating a list of words or phrases. Also, they can be used in the place of a period or a conjunction when two sentences are closely related to each other.

While on this subject, please allow me to vent:

The correct way to use the word "however" in many instances is like this:

"The rain in Spain falls mainly on the plain; however, it also rains in Denmark."