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Because www.drupal.org will transition to D7 before the other *.d.o sites, we need to support multisite apachesolr access across both D6 & D7 sites in the infrastructure.
Multisite search using apachesolr requires 6.x-3.x to work correctly with 7.x sites.
Multisite search using apachesolr also requires apachesolr 6.x-3.x.
So, to facilitate our mixed D6/D7 environment, we'll need to upgrade drupalorg_crosssite to support apachesolr 6.x-3.x and play nicely with apachesolr_multisitesearch 6.x-3.x (and deploy 6.x-3.x versions to all D6 environments in the infrastructure).