Hopefully the last beta before an official 6.x-3.0 release.
#1203360: Publisher ID for Analytics required by dmedia, Les Lim: Change "username" to "pubid" to support AddThis profiles.
#1217644: AddThis script doesn't load when block cache is enabled by Les Lim: disable block caching for AddThis block.
#1098782: HTML attribute size limit 128 for service customizations by Les Lim: Increase #maxlength on custom service HTML attributes field to 1024.
#1221788: New way to disable cookies from AddThis by Les Lim: option to disable AddThis cookies.