This is a very old thread, I know.
Although I don't carry a SAK anymore, the tools I miss the most are the bottle opener and toothpick. I have a Leatherman in my truck (and it's close by all the time) as well as a tool box--they can do more than the SAK did. But, damn, I miss having that toothpick.
Not anymore.
Of course a Leatherman and a tool box can do more than a SAK.