Well servlets are straight Java, so you can write then using the basic Eclipse JDT install. But if you want to start editing JSPs either by source or visually using a designer, connect to databases, reverse engineer your data model to Hibernate-enabled POJOs, hook Spring DAOs into your persistence layer, model and deploy your web application or enterprise application, do visual Struts or JSF development or any other web-specific technology, MyEclipse will help you with that, where as default Eclipse JDT won’t.