This has now been rendered somewhat obsolete since version January 09 and the incorporation of Sparkle into Webkit allowing updates from within the program.

Still Nightshift has been an excellent tool until this point.

broken. It seems that nightly.webkit.org has changed conventions

This app is ok... I prefer to set up a shell script to do this for me automatically overnight. See here: http://cosmotron.org/2007/06/automatically-update-to-latest-webkit.html

upon first use, safari was noticably more powerful. i got rid of firefox at long last!