All the info you need, is provided in the release announcement for m2e 1.1:
m2e 1.1 has been released as part of Eclipse Juno simultaneous release today.
[…]
m2e 1.1 is already included in “Eclipse IDE for Java Developers” package available from http://eclipse.org/downloads/ or it can be installed from Eclipse Juno release repository [2]. Eclipse 3.7/Indigo users can install the new version from m2e release repository [3]
[…]
[2] http://download.eclipse.org/releases/juno
[3] http://download.eclipse.org/technology/m2e/releases