I just noticed, after adding a new link in the right-side column, that the latest public beta of Safari now supports the title tag. Make sure you have the Status Bar at the bottom of the browser window; View menu, then click on Status Bar to get a check mark beside it. Or you use the keyboard shortcut Cmd-Backslash. Now when you hover on a link that contains a title tag, you'll see the title text in the Status Bar.