Here are a selection of links to web sites relating to Grid Computing Technologies.
Globus Grid Toolkit
"The Globus Toolkit is an open source software toolkit used for building grids. It is being developed by the Globus Alliance and many others all over the world. A growing number of projects and companies are using the Globus Toolkit to unlock the potential of grids for their cause."
A do-it-yourself framework for grid computing (JAVA)
A simple tutorial in how to build a basic grid computing application in Java.
Grid Computing Info Centre
If you feel you need a primer, pop over to the info centre for a bit and read. A great resource for general GRid Computing news and information.
IBM Grid Computing
Rather corporate point of view on GRid Computing but well worth a read. It is a very mature project but seems to run solely on Linux platforms.