Wilson
A Wilson A2K DP15 11.75 inches. Just to update this for 2012: Dustin Pedroia, up until this year, has worn the Wilson A2K DP15. For 2012, Wilson redesigned the glove and it is now called the A2000 DP15.
new balance
Louisville Slugger S318 turning model made of maple with a cupped barrel. It is 33.5" L x 30.5 oz.
rawlings
TPX
Rawlings brand. Model: PRO-RV23
A Dustin Pedroia signed 8x10 Photo is worth about $25.-$35. Price will vary based on condition, and the type of authenticity that accompanies the signature. Photo composition, how well the photo displays the signature, the type of ink used, and how it stands out in contrast to the photograph will also effect the value. Sharpie would be most preferred for a photo. Larger and more desired pictures could sell for more. Add for inscriptions. Collectors will pay more for inscriptions such as "MVP 2008" or "ROY 2007" and pay less for personalized inscriptions like "Good Luck Chuck" Signatures authenticated by Steiner sports, or Mounted Memories that use authentication holograms sell at a higher price. In a recent auction a Dustin Pedroia signed8x10 photo sold at a high of $39.50 For a sample of a Dustin Pedroia signature see related Links below.
Rawlings
It depends on the player. All players like a different feel for their glove so there is no standard.
Jimmy Rollins uses a Nike baseball glove as he has a contract to use all Nike equipment. His cleats and batting gloves are also Nike.
Use a "Silver Metallic" Sharpie brand felt tip Pen
Probably Rawlings. I got a Rawlings glove and i hate it i've had it for three months and it still isn't broken in. I HATE IT