Starting with Eclipse Helios (3.6), released June 2010 Eclipse Foundation includes their take on the AppStore -- Eclipse Marketplace (EMP). But although I've been using Eclipse Helios every day since summer, I haven't even noticed the EMP and installed all plugins the old-fashioned way.
The main reason for this is that I'm a long-time Eclipse user and for the longest time the installation and update of plugins was such an excruciating process, that the easiest thing to do was to just drop them into the plugins folder and hope for the best.
To my surprise I discovered that it has changed with Eclipse Helios. We decided to release the new major version of JRebel, coincidentally also 3.6, to the Eclipse Marketplace; so I went through a flurry of installing it, uninstalling it, updating and generally stress-testing the Eclipse Plugin Manager.
I'm happy to say that it works nicely and suggest to take a moment and hit the Help -> Eclipse Marketplace to have instant access to hundreds of rated plugins. Considering that the highest number of downloads is only 5701, it seems like the Marketplace doesn't get the attention it deserves, what's do you think?