First of all Im running Windows XP SP2 on Dell Latitude D820 which has 4GB of Ram and  Dual Core 1.66Mghz Processor.

My eclipse .ini settings are:

-showsplash
org.eclipse.platform
-framework
plugins\org.eclipse.osgi_3.4.2.R34x_v20080826-1230.jar
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms128m
-Xmx768m
-XX:MaxPermSize=256m
-XX:-UseParallelGC
-XX:+AggressiveOpts
-XX:-UseConcMarkSweepGC

Also recently I read these posts and turned off paging in windows and my ide performance has improved and I have had no wierd other problems with out of memory errors or anything like that.

eclipse.dzone.com/news/what-java-ide-vm-arguments-do-you-use

www.codinghorror.com/blog/archives/000422.html

alan.blog-city.com/windows_virtual_memory.htm

http://www.waltercedric.com/java-j2ee-mainmenu-53/107-eclipse/1298-boost-eclipse-speed-performances.html

We are running tomcat 5.5.25 on jdk 1.5.0_10. Java Rebel is supposed to allow changes to java classes on the fly and then use an IDEs built in background compilation to compile the code so that you can remove the step of having to redeploy a web application through standard apis such as tomcat undeploy and deploy.  

My experience with this overall was that initially I had some issues getting it setup but in response to my blog article I heard from Jevgini Kabanov a developer of javarebel and he helped me get it setup.

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