Andrew (my oldest) and I built the NavBot this weekend. It basically is the RoverBot from the 2.0 directions with the tread instead of wheels. Its able to turn on its center so we should be able to play with the nav java programs from the Core Lego Mindstorms book.
I'm not sure yet if we will build the electronic compas. Anyone else built it? If so please post a comment and let me know how it went.

Finally had some time to play with EMF over the weekend (the topic of one of the books I'm currently reading).
It was very cool. I had a whole set of model objects persisting in XML in a snap. It was not the cheezy model that is shown on the eclipse site either. I actually had multiple relationships between many of my classes as well as some of the so called 'volitile' relationships. It was really cool that it just worked.
I did have a few probles with the Omondo UML/EMF tool. I found that deletion of model elements can sometimes corrupt your model. I ended up hand tweaking the model the first time that I got bitten, after than I was very careful to check everything after every delete and make sure that it was not hosed.
All in all a very grooy time geeking out with the framework. I'm hoping to try out building a custom persistence plugin for the framework. From reading the book and looking at the API it should be possible to put the model objects into a relational db.

Well I upgraded to the latest version of roller, and things went smoth as butter.
In addition to having to run the db update script I had to update my roller context in the server.xml file to point to the new columns and new tables introduced to workaround key words in db's other than mysql. (I'm assuming that was the reason for the change). The changes are highlighted in the roller dev Wiki
Very cool how easy the upgrade was, kudos to the team!
I also took the time to figure out what the comments problem was. The logs were showing it the whole time. I did not have the java mail jar's in the classpath ($tomcat/common/lib is an easy place to put them). Dooh. So I finally have comments enabled and they work!