I just posted this in another thread... everything you EVER wanted to know about modern TrekLit continuity
http://www.trekbbs.com/showpost.php?p=4002408&postcount=3
Excellent summary. If you want to cull list that down a little, I'd suggest these:
Articles (If you want to know more about some of the events, go back to the
Time to series and the first 2 Titan novels)
Orion's Hounds (the best of the Titan novels, IMO. This book will give you enough intro to the ship and its crew. And Troi finally gets a good story!)
Greater Than the Sum (the best of the post-
Nemesis/pre-
Destiny TNG novels [no, Christopher is not paying me!] There is enough recap about the other TNG novels towards the beginning of the book that it will bring you up to speed.)
Destiny trilogy (Now, if you want to know more about some of the Aventine's crew, read
Unity from the DS9R series beforehand. It has a thorough recap of the DS9R books that came before it before you even read the first chapter.)
So, that reduces you to only four book before the
Destiny trilogy:
Articles of the Federation,
Orion's Hounds,
Greater Than the Sum, and
Unity. That's not quite as daunting.
Now, since you've asked specifically about Voyager and DS9:
The two latest Voyager books,
Full Circle and
Unworthy, are excellent novels! In
Full Circle, Kirsten brings you from the four Golden novels to the current timeline. In
Unworthy, Voyager is part of a fleet that returns to the Delta Quadrant.
In December, there will be a new DS9R novel,
Rough Beasts of Empire, written by DRG3. It will bring the DS9 saga up to the "current" timeline of TNG, TTN, and VOY.