plone.app.jquery adds jquery library to Plone.
Version numbers of the package is the same as the jQuery library + packaging version.
Available versions of this package are: - 1.7.2 - 1.4.4
jQuery 1.7 is not supported on Plone < 4.3. So if you have dependencies on plone.app.jquery you should pin it in your buildout configuration to 1.4.4.