q1: Eclipse 3.4 comes with the project WTP 3.0
q2:
http://www.roseindia.net/spring/ use this tutorial to install spring normally
if you will not modify the springs source code, anyway spring-framework-2.5.5-wit
h-dependen
cies.zip
doesn't contain sources, you will install the spring framework apart.
q3: to make spring development with eclipse ide, use spring plugin :
http://springide.org/project/wiki