It is tiring job to get the plugins for eclipse 3.2 such as XML Editor. instead of this it is defintely a gud idea to get the latest Eclipse Version and work with it. Atleast I tried to get WTP tools but does not went my luck well. During this process, I came across with the following sites..
http://www.crionics.com/products/opensource/eclipse/eclipse.jsp
A good pluing for XML : http://sourceforge.jp/projects/amateras/wiki/AmaterasIDE_2_0_5
Easy ways to install eclipse plugins: http://www.venukb.com/2006/08/20/install-eclipse-plugins-the-easy-way/