If you ever saw the following error while trying to run, for example, the deploy ant task of your portlet: Task cannot continue because ECJ is not installed.
If you tried to install subclipse in your eclipse, perhaps after the restart and while trying to configure your first SVN repository, you encountered the following error (in Mac OS X):
I have created a project in eclipse with the google plugin that should run on the app engine.
If you are using log4j then you probably are tired of the copy/pasting the logger from on class to an other.
Some time now I had a problem with running a dynamic web app project in eclipse as a web application (right click on project name and then RUN AS > RUN ON SERVER).