Coinciding with the announcement of Android 4.1 Jelly Bean, Android developers can now pull down a new revision of Android's SDK tools – revision 20, along with a new version of the ADT Plugin, also r20 (which Eclipse users will need to use SDK r20).

The revised SDK tools bring several improvements. One of the notable additions to the SDK tools is System Trace (otherwise known as systrace), a tool (included in Project Butter) that helps monitor system activities, allowing developers to pinpoint graphical rendering or other issues. For those wondering just what else is new, take it from the revision notes found at Android's Developer site:

General notes:

In addition to these changes, the new SDK tools bring several bug fixes:

Bug fixes:

The ADT Plugin also brings myriad improvements, from Application Templates to Performance, Tracer, and Lint to Layout Editor, Build System and more.

More information can be found on the respective Android Developer pages for the SDK Tools and ADT Plugin. To grab the updates, just fire up Eclipse and your SDK manager.