Just like with the Opera web browser, it is now possible to have nine of your most-used sites as a homepage in Safari, quickly accessible by pressing numbers 1 to 9. But unlike speed dial on Opera, Safari Dial is an online app.
The sites are presented with screenshots of the pages. No registration is necessary, and your unique homepage can be accessed from multiple computers. This online app also works fine on Firefox (and probably other browsers), and makes a good alternative to Firefox's Speed Dial extension.
[robg adds: I use Fast Dial with Firefox, and find it quite useful. For those using Safari, this service seems pretty safe -- there's no registration needed, and you access the start page via a unique code.]
Mac OS X Hints