A number of videos have surfaced that demo just a couple of the changes made in the latest Developer Preview of Mac OS X Lion which was released towards the tail end of last week. The update which brings Lion onto its third developer preview included a number of visual tweaks as well as under the hood changes.

The update is available to Mac developers via Software Update or as of today via the Mac Dev Center.

The first video shows the new login screen and transition:

The second video shows the new Reading List feature which is available in Safari and acts very much like bookmarks allowing pages to be saved for future reading:

Safari also has a new download manager: