For the first time in a long time, this release isn't for WordPress but Safari.

CJD Transmogrifier takes the concept of a thumbnail sidebar introduced in SafariStand to its logical end, by installing modified versions of browser.nib for Safari and HTsidebar.nib for SafariStand.

Once installed, when Safari in restarted you will notice that there is no longer a tab bar!  Tabbed browsing still works, you just aren't given the tab bar to use to interact with your tabs.  Now if you set the 'Show sidebar' preference in Stand, you will have the thumbnail sidebar without the tab bar to muck up the look.

Here is a video of the results of installing CJD Transmogrifier: