Google published updates to android tools and the adt. Android Tools r7 has updates to Library Projects to use aidl files and some improvements in ant build targets. ADT improvements including the ability to have the src folder be renamed something else in Library projects and some new resource qualifiers.
Caution: Google is warning that the ADT 9.8 plugin should only be used in Eclipse 3.5 and not eclipse 3.6 at the moment.
To get both updates start up your android avd manager in your Eclipse IDE or from the command line and download the android tools update first.