The bowlers who are in international arena, four names comes immediatly to the mind.
Monty Panesar, has a bright future. he may not be a Murali or a Warne, but can become a clas finger spinner like Saqlain.
Jeetan Patel - very very steady bowler, and turns it too.
Abdur Razzaq - going to be a legend in ODI cricket. His misery is Gavin Larsen esqe in ODIs.
Enamul Haq (jnr) - Spins it a mile, and has lot of variations too. Better variety than Panesar. If he plays regularly I tip him to be the next greatest spinner.
Talking about SL, Malinga Bandara, Rangana Herath, MMM Suraj, and Dilruwan Perera are leadin spinners at the moment.
Herath is 29, so we could not expect a long career from him. But he's heck of good left arm spinner. I love to see him bowling on same pitch as Monty for world to see Herath's Wizadary with line, length, flight and speed. He posses a doosra too, spinnng in to the right hander, in addition to arm ball.
Bandara has makings of a good ODI spinner, but far too flat and quick for a test leggie. Unless he slow down and flight it more, am failing to see him taking bucket load of wickets in international matches.
MMM Suraj, is a tall off spinner, who put loads of over spin on the ball. He balls brisk too. This makes him the off spinning version of Anil Kumble. Steep bounce s his weapon. He has a quick slider also, which rushes in to batsmen, but his stock ball is the most venomous one.
Dilruwan Perera is a slow bowling all rounder. He can turn the ball appreciably, and armed with a good slider too. He'll be a fixture in SL ODI team within next 2 years. When Jayasuriya calls it a day, Perera will take up his spot as opener and 5th bowler of the side (He's a good hitter too).