I've been looking for a Java IDE for both Windows and Linux. Currently I'm comfortable with Visual J++ 1.1, but since its old ( and unsupported? ) I was wondering what the best ones out there are. And ...

Eclipse is generally recommended. (Personally I think it blows but many here like it) I think there is also netBeans. Those are the two free java IDEs I know. A quick google search will bring them up.