The Mail component itself offers almost all you can think of you need for a simple newsletter.
But, since it offers different subscriber lists it does not offer that a subscriber can choose in what list he/she will subscribing in. He/she can choose a list but the subscription goes in the list the admin has choosen as a default.
Maybe in one of the next versions a subscriber really does have the choice of subscribing to the list of his/her choice.

JDownloads is the most complete download component I have found for Joomla!
After using docman for many years I had to look for a new component since docman seems to not really be in a hurry to develop a native 1.5 version. So I finally found JDownloads and was impressed about the thousands of settings you can do in there.
When started I really didn't have read all about the settings and came up with a question which was replied in a reasonable to good time.
Finally I really can recommend this component to all users

This module is doing exactly what it is supposed to do - flipping open menu items based on second level