SRAM do two types of shifters, Shimano compatible and ESP.

The Shimano compatible range use 1-2 cable actuation. I don't know much about the bottom end but the top end Rocket shifts very sweetly.

The ESP range has 1-1 actuation which SRAM claim gives more precise shifting. The ESP range starts with ESP Gripshift 3 (which works very well IMO) and goes up to ESP 9SL.

As you go up the range the higher end shifters have an easy change cable port, but do suffer from an unneccessary 'pointer behind window' indicator, but then so do some of Shimano's shifters. Most of the shifters are available in both half-pipe too long for my taste (you could accidentally shift) or shorty (you'd have to have severe hand-coordination problems to accidentally shift). Some of the shifters are available in an 'amy' grip which is of a narrower diameter for small hands.

ESP rear shifters can only be used with an ESP rear mech. All front shifters including ESP are compatible with Shimano front mechs.

SRAM are about to launch a new Derailleur called XO I think.