For those that like to be using the latest and greatest, the Ganymede M4 packages are now available from the Eclipse Packaging Project (EPP) download site.
This year EPP is going to produce packages for each Ganymede milestone and release candidate. This will hopefully make it easier to test the packages before the final release and find cross-project issues. Of course if you find issues with the packages, please report them in bugzilla.
Ian Skerrett 
This is a great step forward. Having packages available early will ensure that the final released packages will have improved quality. It’s a wonderful way to get the community more involved.
Great to see this! I added a link to the corresponding near the top of the Mylyn download page, and will figure out if we can make it more prominent.