It is an extremely good resource on UML, Design Patterns, Methodologies and related stuff. You will also find some PDFs on UML. Please check it here.

Like lots of others AOP enthusiast computerist (aka developers, architects, leaders etc.), I am also still looking for some good examples on Aspect Oriented Programming (AOP). Last time a have written a little about AOP but frankly speaking I am still not very sure about the usability of AOP especially in business applications. We talk a lot about exception handling and logging but these covers only a small portion of actual software.

In portal world, eXo and Jetspeed are using AspectJ in their code but I have still to check where exactly are they using AspectJ and for what purpose.

I got this paper from OOPSLA. Here the author of this paper has tried to re-implement famous GoF Design Patterns with the help of AspectJ, the AOP tool in Java. You can get the PDF here.