If you are looking for a Espionage or Modern D20 ruleset, look no further than SpyCraft.
Enhanced gear and gadgets allow any budding Bond wannabe to equip themselves with the latest high tech equipment. Good selection of character classes and feats. Game runs smoothly though can be tough for new players to get a handle on it. Once they do it's well worth playing.
The game also has a number of supplements/mission for GM's to use.
Only Con that nearly caused me to knock a star off, is that the tables in the book are laid out oddly and difficult to find.
[5 of 5 Stars!]