Nine posts and noone mentioned George R R Martin!?
 Ugh, no.  The books are bad enough.  With respect to you and the rest of his fans, I can't stand his writing.  
A TV-series by HBO is in the works. One season for each book.
Words cannot possibly express how appalled I am to hear this, especially seeing how there are so many better authors out there who actually deserve to have their work translated to the small/large screen.  
 
  I would like to see David Weber's "Honor Harrington" Series made into a mini-series with some full length movies added.That's got real potential.
Oh, absolutely!  Although I agree with 
WIllythemailboy that it would be better as an actual TV series.  
Casting such a show used to be a hot topic on Baen's Bar, but nothing's ever come of it. The only name I remember is that Angelina Jolie is absolutely banned from any role. Weber loathes her as an actor and as a person.
....Which is a pity in a way, as I think she resembles the character far more than any other actress I know of.  That said, though, I can't blame him, as I largely agree with his opinion(s) of her.  
Katie Sackhoff, perhaps?  Or how about -- especially given that Honor is supposed to have Oriental features from her mother -- Grace Park?  (You mentioning BSG inspired my choices. 

 )