It's been <%= (new Date()).getTime() %> milliseconds since the epoch.
Which, if you’re like me is great. You could use Google Closure Templates, which probably is faster, but then you would have to precompile your templates, which is a pain.
The only problem I personally had with the Resig solution was that if you tried to call a variable that didn’t exist within your data object, it would fail horrifically, so I modified it slightly to be slightly more forgiving:
The 12th line where it says .replace(//g…) includes a test for the data that is being passed into the function that’s being created to output just an empty string if the variable is undefined.