here you can find zip-files of my working visual editor for eclipse 3.3, 3.4, 3.5 and 3.6 (helios)
These files are non official builds. So you use it on your own risk.

2010-08-29: prelininary eclipse 3.6 (helios) version
link: ve_eclipse_36_win32_201008292115.zip
notes: unzip and put it into the dropins directory
important: the java beans selection palette is broken, you have to use always "choose bean".

2009-01-18: note for installing ve with eclipse 3.4.1 ganymede
install RCP use software update for "JST WEB CORE" and "EMF - Eclipse Modeling Framework Runtime and Tools" install the my zip's.

2008-07-11: are the actual packages for eclipse 3.4 ganymede
link: ve_eclipse_34_200807092330_lin_mac.zip
link: ve_eclipse_34_200807092330_win.zip

2008-05-23: here is the patch, which can be applied to cvs source
link: patch_ve34m7_v200805121900.txt

2008-05-21: these are new files built directly from cvs sources with 2-3 bugfixes - This version can be used with eclipse 3.4M3 (3.3 untested). here is a screenshot of the configuration
I used to test. For your information the VE-feature is not shown in some cases on the software update window. the VE should work even you can create a new visual class. WTP (for jem), emf-sdo-xsd (runtime only) and gef(runtime only)
link: ve_eclipse_34M7_mac200805121900.zip
link: ve_eclipse_34M7_lin200805121900.zip
link: ve_eclipse_34M7_win200805121900.zip