Thanks for the great tutorial (2nd part of your "Getting started with Roo")! I followed most of it without any issues!
However, when I got to the point of creating the eclipse/spring STS project files and loading it up into STS to edit the applicationContext-security.xml file I ran into some red error flags from the IDE. Specifically when trying to add the "use-expressions" attribute to the <http> node. Apparently the spring security xsd pointed to in the context file was 2.0.4... which is the one Roo automatically put in there. I changed it to 3.0 and the errors went away. I am using Spring STS 2.1.0.SR1, and Roo 1.0.0.RC2.
For reference, the exact tutorial to which I refer is here: http://blog.springsource.com/2009/05/27/roo-part-2/