Alternatives
the only alternatives I see is Picasa or Flickr, Aperture and iPhoto have Flickr integration and quicktime x will get flickr integration in Lion as well. I think I am going with flickr if apple drops galleries. It's $25 a year for 100GB, and you can upload 90 sec HD videos clips when syncing through aperture as well. The google plugin support for Picasa in aperture is nice, but it ignores videos. It's also not a sync tool, it's an upload tool, flickr stays in sync in Aperture like galleries does.