Linus no longer works on the stable linux series (2.4)
Linus works on the 2.5 series which has had releases all the time.
Marcelo is working on the 2.4 series and 2.4.19-rc1 is out so i guess 2.4.19 final isn't that far away.
besides, it's a good thing that we no longer have stable kernel releases every month. remember the 2.4.15 fiasco?