How does WDSC compare

[Brian Leathem <bleathem@xxxxxxxxx>]

How does WDSC relate to, and compare to the free WTP, and the commercial 
MyEclipse?  Specifically:
* Do they share a common plugin base?  ie. are WDSC and MyEclipse based 
on WTP?
* Are the projects interchangeable?  For instance if I use the Java GUI 
tool in WDSC, can I work on the same project (on my Mac) using either of 
the other tools?
* What features are unique to the various projects?  (Aside from the RSE 
in WDSC)

These are general questions, but there seems to be a significant amount 
of overlap, and I am interested in what makes them different (or the same!).

WTP: http://www.eclipse.org/webtools/
MyEclipse: http://www.myeclipseide.com/

Brian