The Technic Civilization Saga by Poul Anderson and published by Baen Books via Webscriptions.
This is a tour de force by Baen and encompasses the entirety of both the
Polesotechnic League series in three anthologies;
The Van Rijn Method
David Falkayn: Star Trader
Rise of the Terran Empire
and the following Terran Empire series in three anthologies;
Captain Flandry: Defender of the Terran Empire
Sir Dominic Flandry: The Last Knight of Terra
And fourth coming in April 2011 the conclusion Flandry's Legacy
The entire series contains a total of nine books and thirty-three novellas and short stories. Classic Science Fiction at it's finest.
I strongly recommend purchasing the Webscription months that contain each anthology since you get between 5 and 7 more ebooks for a few dollars more.