Here are my flyers in various leagues (two 12 team H2H, one 14 team roto, one 16 team roto):
John Bowker: Named opening day LF for the Giants. Completely reworked his approach in Triple-A last year. Given the uninspiring options to slot in the heart of the Giants order, he could find himself in a favorable run producing spot. Left-handed and playinig half his games in AT&T means his power potential probably falls in the 20-25 HR range instead of perhaps a smidge higher.
Gio Gonzalez: Named the 5th starter for Oakland. Tantalizing K-rate, great home ballpark, but erratic control allow him to be a roster and see candidate.
Colby Lewis: Awesome K:BB rate in NPB. May be a Quad-A type, might not be. Not expecting earth shattering numbers, but 140-160 K's in 200 IP seems plausible with decent ratios if he can keep the ball on the ground and out of the air in Arlington. Upside may be greater, but I'm tempering expectations.
Kyle Blanks: A cleanup hitter hitting behind an OBP machine like Adrian Gonzalez with legit 30 HR power for cheap? Absolutely sign me up.
Brandon League: David Aardsma

League was the prime piece returned for Brandon Morrow, and his GB rate and K-rate play well as a stopper. Should be next in line as soon as the wheels inevitably fall off the Aardsma bus.
Jason Motte: Not a huge fan, but think his k-rate is solid, and have zero faith in Franklin holding the closer gig until the ASB let alone the entire season.