I had checked the list the last year(july 2011 to about May 2012, so it was not for skillselect one though).
My occupation was cook and it was "not available" begin with, and became "available" after a few months.
Retail pharmacy was off/on the list, a few other occupations joined the list etc etc, some movement happened, but it wasn't every month.
Just keep an eye on the list all the time as well as seeking another visa option like employer sponsored.
Good luck.