Safari 4 and Bookmarklets
Invoking the Delicious or Instapaper bookmarklets with the mouse creates a pop-up window. When invoked with the keyboard shortcut (command - #) the popup window is shunted into a new tab.
With Instapaper the behavior is welcome since no interaction is needed. With Delicious it is kinda annoying since I probably want to add tags and click to save.
