I tried Sun Studio Creator, but its uncessarily complex. For JSp its creates unwanted tags [due to Netbeans taglibs].
Try EasyEclipse. Its GREAT,
EasyEclipse is built on Eclipse 3.1 and hence its free.
EasyEclipse
http://www.easyeclipse.org/site/home/index.html
EasyEclipse Plugins
--> Amateras JSP, HTML, XML editor
--> Weblogic Server Plugin for Eclipse
--> JBoss IDE
--> J2EE Tools
--> ....................
http://www.easyeclipse.org/site/plugins/index.html
Try the Amateras plugin which has JSP , struts support, code assist in side jsp, preview, JSP pallette etc.
Regards
Rohit Kumar