I’m a Fedora 12 user (still haven’t upgraded) and couldn’t get the plugins for Android to work in my version of Eclipse. However, I kept getting the message “Can’t Install ADT. org.eclipse.wst.xml.ui is missing”. An easy Google search found me the website http://stackoverflow.com/questions/2412352/cant-install-adt-org-eclipse-wst-xml-ui-is-missing. Work now!