Until Eclipse Galileo, the easiest way to install plugins was to :
1. Search for the plugin on Internet (by using the Eclipse Plugin Central for example)
2. Get the Update Site URL to be used in Eclipse's Update Manager
3. Go to Eclipse Update Manager, register the plugin host using the Update Site URL
4. Follow the instructions to install the plugin
Now, with the Eclipse Marketplace, no need to leave Eclipse :
1. Access the Eclipse Marketplace via the Help menu
2. Search for the plugin by entering some relevant keywords
3. Click the Install button of the plugin
4. Follow the instructions to install the plugin
I needed to use SubVersion on my freshly installed Helios. Let's see what the Eclipse Marketplace looks like and how easy it is to install plugins.
1. Access the Eclipse Marketplace via the Help menu.
3. Click the Install button of the plugin (I chose Subversive).
4. Follow the instructions to install the plugin, and restart Eclipse. The Subversive plugin is now listed in the Installed tab of the Eclipse Marketplace.