New Java Class wizard does not allow creation of class named package-info.java 
which is used to store package level annotations. As a result it is very hard 
to create such a file within the IDE.

See 

http://java.sun.com/j2se/1.5.0/docs/guide/javadoc/whatsnew-1.5.0.html

"
package-info.java: You can now create a source file with this name to store 
package comments and annotations. It can be used in place of package.html 
(which supports only comments, not annotations). If package-info.java is 
present, javadoc should ignore package.html and look instead for the package 
doc comment immediately preceding the (possibly annotated) package 
declaration. The javadoc tool handles the selection and parsing of package-
info.java and package.html and passes the doc comments to the doclet. 
"