If you really have a passion for IT you usually end up with several technologies that you think are really neat but you don't have a way to use them everyday. For example, I have a friend who thinks the whole world should be stored in XML. But he struggles to implement XML in a product he's is developing. I call these technologies "Holy Grail" technologies. These are things that you think about everyday as you search for a nail to use these technology hammers on.
Currently I'm obsessing on a couple "Holy Grails".
2. Satellite/Wireless technologies
I will post more on these later. I'm a little pressed for time.