So , WordPress 2.7 RC1 is now available, I suggest to update to this version and play around with the new layout. Thanks to the release delay and your feedback I catch some additional bugs (Piclens, SinglePic scaling). This will be the last release candidate until I upload the version to wordpress.org. Please note that I removed Thickbox now from core, and switched over to Shutter Reloaded, a more lightweight effect. Due to the fact that Thickbox is part of WordPress you can still stay at this effect, only some minor changes from myside are not longer available (Fullsize link).
Final Release Candidate 2