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I know, that -X compiler options are subject to change in future JDK versions, but most are here now and in the next version. Eclipse has a nice UI for it, NB only has one textfield to enter them by hand. For example, compiler memory (-J-Xmx) and Java 5.0 generics switches (in Eclipse under J2SE 5.0 compiler options).
Not for 5.0, but sound good for the next release. Adding Jano to CC