trigras

Basically only tool selection menu was added (and some context menu removed ;). IMHO to use it out of the box it's quite easy, just maybe there is lack of documentation. As main drawbacks I could note missing documentation and not so easy configurable .. However at the moment it fits my needs.

EC2 micro instance

up to 5 request per second

AWS micro instance apache + tomcat java, mysql

My ques is that may be due to some misconfiguration (java or tomcat).

Strangely it is not dead. Do not know how widely it is used. From other hand what are other good standardized options to share/document software structure and behavior?

Diagrams are stored in database. Did not get about "lost diagrams"? Why should they be lost? Generally agree there still are places for polishing. The idea was to create app that can just do it's job , to see if UML is still used at all (as stblack also asked) and then polish it according to the feedaback.

Thanks.