I've always found ants to be fascinating. As a toddler I found a wonderful fuzzy red "ant" and got badly stung. It was a velvet ant which isn't an ant but a wasp! That didn't stop my interest.
Here's a nice video about ants and scientists in the San Francisco, California area:
And here is the Ant Web site they talk about in the video.
My favourite ant site is MYRMECOS: Alex Wild on insects, science, and photography... lots of pretty pictures and interesting tidbits about ants (and other bugs).