2008
I believe the most popular driver is the Titleist 905r Driver. Their new model the Titlesit 907D2 will probably take the mantle in the future
Titleist 909 D2, 8.5O with Fujikura Rombax 7V05.
A Titleist Driver can be purchased at many golf stores. Here are some of those stores 3 balls, Golf Galaxy, global Golf, PGA Tour Shop, Golf Locker, Amazon, Ebay, 2nd Swing, and Fairway Golf USA.
Tiger Woods uses these clubs: his driver is the Titleist 975D, his 3 wood is the Titleist PT 15, his irons (2-PW) are the Titleist Tour Forgings (681), his wedges are the Vokey 258-08 and Vokey 260-06, and his putter is a one-of-a-kind Scotty Cameron by Titleist . He uses Golf Pride Tour Velvet Cord grips.
Titleist was created in 1932.
Ian Poulter normally uses a Cobra ZL Driver, a Titleist 909 F2 Fairway, Titleist Vokey Wedge, Titleist 909 H Hybrid Fairway, Cobra Pro CB Irons, and a Rife Aruba Putter. But at the Royal Birkdale, he used: Driver: Cobra Speed Pro Fairway Woods: Cobra Speed Pro Irons: Cobra Pro MB Wedges: Vokey Design Spin Milled Putter: Odyssey Black Series This is according to data from when this questions was asked (July 13, 2010).
Absolutely zero. He is not sponsored by Titleist. He only uses a Scotty Cameron putter which is under the Titleist brand, but he does so out of choice.
Titleist dead center model SP-201UP
This is because Titleist has agreements in place with PGATOUR.COM and The Golf channel that they will indicate which players use a Titleist ball.
The Titleist Pro V 1 is a 3 piece ball. The Titleist Pro V 1x is a 4 piece ball.
DL3 plays the Titleist D910D3 Prototype with adjustable hossel. He played for years the D909 and was one of the last pros to switch from a persimmon driver to a metal driver (1996). He is still in the top 15 long hitters on tour at 46.