There is an excellent resource (blog?) titled The Server Rack FAQ which has excellent articles, many complete with videos. The writing is excellent and the site appears to be quite comprehensive.
There is another blog called Data Center Links which has lots of good news as well as a good but not overwhelming set of links. Go check the links out!
There is also the Data Center Knowledge web site which seems to be an excellent and frequently updated news source relating to data center topics.
One topic seems to be hot: data centers in a container. Sun came out a while ago with the Sun Modular Datacenter (also known as Project Blackbox). HP has the Performance Optimized Datacenter (POD). Data Center Knowledge has a nice video about the HP POD. There’s also a nice discussion with HP about the POD from NetworkWorld. Dell announced that they will be powering Microsoft’s cloud initiative with data center containers.
Sun Microsystems has a lot of videos, including many about their data center in a box – including a tour or two, as well as an intriguing test of the durability and operational capability of the data center in a box.
This is definitely an exciting area to watch.
An up-coming conference is the Data Center World conference in Las Vegas, Nevada on March 8-12, 2009. I can’t speak authoritatively to whether it is good or bad, but I would say given the presenters and topics and so forth, it sounds like a conference to consider.