I can find very little info on the PT908, no onger listed on Taurus website. All I know for sure is that the 908 has a single stack mag 8rd factory, but you can get 10rd mags for it and this model is no longer made since 1997. The PT908 is nearly the same as the PT909 accept the 909 has a tac rail and either 10rd or 17rd mag depending on your local laws (908 and 909 mags do not interchange).
I heard a rumor that the PT909 is no longer made, but I can not confirm this. The PT809 (polymer frame) could be the replacement for it... The PT911 looks nearly like the the PT909, but without the tac rail and holding 2 less rounds.
I think I will be searching for a PT909 now, along with a PT917cs and a few other Taurus pistols...
PT908/PT957
http://www.kitsune.addr.com/Firearms/Auto-Pistols/Taurus_PT908.htm
PT909
http://www.taurususa.com/products/product-details.cfm?id=339&category=Pistol
PT911
http://www.taurususa.com/products/product-details.cfm?id=344&category=Pistol
911B
909B
908/957
Got this tid bit from: http://www.pmulcahy.com/pistols/brazilian_pistols.htm
Taurus PT-900 Series
Notes: This is a "Commander-sized" Taurus pistol. It has fixed sights, a decocking lever, a firing pin safety, and an indicator that lets the firer know whether the chamber has a round in it, even if the slide is closed and there is no magazine in the weapon. The finish may be blued or stainless steel and the grips are checkered rubber. Production of the PT-911 ceased in 2001, but the other members of the PT-900 series are still being built. The PT-940 and PT-945 are especially popular among this series; they are in fact still acquiring modifications according to customer demand. The PT-940 picked up 3-dot-type combat sights along the way; the PT-945 has a number of variants, including the PT-945C, with compensator ports near the muzzle to reduce muzzle flip, and PT-945S, which chambers the more powerful .45 Super cartridge. Most of the PT-900 series was originally exported to the US only with 10-round magazines, but with the sunset of the Assault Weapons Ban, larger magazines have been designed for most of this series. Most of this series have 4-inch barrels, but the three PT-945s use 4.25-inch barrels, and the PT-938 uses a 3.7-inch barrel.
Twilight 2000 Notes: The PT-945C, PT-945S, and PT-957 do not exist in the Twilight 2000 timeline. The PT-945 is rather rare, and with the exception of the PT-911, the rest of the members of this family are very rare.