There is an excellent hadoop port numbers reference posted by the Cloudera people http://www.cloudera.com/blog/2009/08/14/hadoop-default-ports-quick-reference/.

Hadoop uses a lot of ports to communicate between the nodes and to provide the UI. The quick reference guide make it easier to keep track of what is going on.

Just posted a tutorial on how to configure hadoop environment for Windows using CYGWIN.    The tutorial explains how to set-up a hadoop cluster in the pseudo distributed mode and how to get it working with the Eclipse.

If you have any questions / comments / suggestions about this tutorial post them here.

The tutorial is located here.