Is it possible to use AppleScript to open a link in a new tab in Safari?
I can't comment :-/ so I will answer to say that Tim's answer (above) works as of OS X 10.8.5. This one-line version of his script also works:
tell window 1 of application "Safari" to set current tab to (make new tab with properties {URL:"http://www.stackoverflow.com"})
Arrgh -- the one line is overflowing. Here it is without the code tags:
tell window 1 of application "Safari" to set current tab to (make new tab with properties {URL:"http://www.stackoverflow.com"})