Anime News Network Nanoha pages;

Magical Girl Lyrical Nanoha

Magical Girl Lyrical Nanoha A's

Magical Girl Lyrical Nanoha StrikerS

While I haven't been able to see all the series all the way through, I think it's some really good stuff.
Nanoha is not the uber-kawaii Sakura Kinomoto . . .
she is also very not Usagi/Serena /Sailor Moon . . .

You will see a theme or two you might recognize from some other shows,
not necessarily anime
and they are used in very unique ways.

There is nothing else quite like Magical Girl Lyrical Nanoha
and that's what makes it great.

Unfortunately Geneon had the North American distribution rights so there's no telling when or if we get to see this "adventure".
Let's hope for the best!

As of 2008-09-22 The Nanoha Box set will be out on Nov.11th, 2008
I think this is only the First season, it's only 325 minutes and that's 13 episodes at 25 minutes, according to the info at Amazon.

Distributed by Funimation
Nanoha A's is also listed as licensed.
No news about StrikerS.