If you want to install a new plugin into Eclipse (since version 3), you can do it following way:
menu Help -> Find and Install
Search for new features
New Remote Site
List of Eclipse plugins I use:
PMD (static checking of source code, you can use predefined constructs or add new, these are checked to be correct)
http://pmd.sf.net/eclipse
Subversive (integration of Subversion into Eclipse)
http://www.polarion.org/index.php?page=overview&project=subversive
Subclipse (integration of Subversion into Eclipse)
http://subclipse.tigris.org/update_1.0.x
Tortoise plugin (integration of Subversion into Eclipse)
http://www.tabaquismo.freehosting.net/ignacio/eclipse/tortoise-svn/tortoisePlugin_1.0.9.zip
AnyEdit (nice source code in Eclipse)
http://andrei.gmxhome.de/anyedit/links.html
