The latest thing I'm into - technology wise - is REST. That's REpresentational State Transfer - the architecture of the World Wide Web. The term was coined after-the-fact by Roy T. Fielding who designed and built some of the core technology of the Web many years ago.
What REST is all about is how to design software systems so that they scale - across organizational boundaries and over many many machines. It's a really simple way to design systems, but the details are hard to extract from the existing technology. There is a site all about this - check it out : http://conveyor.com/RESTwiki/moin.cgi
The REST site moved REST Wiki