I recently checked out Eclipse and MyEclipse. However my current client uses JDeveloper.
From what I could see, MyEclipse could not remotely deploy J2EE apps from the IDE to the Oracle Application Server. If someone knows otherwise, please let me know.
JDeveloper has the nice feature of creating a .war or .ear file for your project and then based on your connection to the App Server, the ability to right-click on it and deploy remotely.
In the end though, .war and .ear can go to any App Server. So it's just a matter of how convenient you want the deployment to be. For instance, I have ias_admin priveleges on my client's
test server, so I can remotely deploy using Oracle Enterprise Manager after I've created a .war... regardless of how it's created (IDE vs
ANT for example).
If you have any questions just ask. I'm currently knee deep in JDeveloper/OracleAS (10G).