Examples are a great way to get started with any programming system and we include a number of them here. There is also a whole directory of examples in the ITL distribution, including several interface examples.
Incomplete LU with Threshold Preconditioner
Incomplete Cholesky Preconditioner for symmetric positive definite matrices
BiConjugate Gradient Stabilized
Generalized Conjugate Residual
Transpose Free Quasi-Minimal Residual
GMRES with classical Gram-Schmidt Orthogonalization with iterative refinement
GMRES with modified Gram-Schmidt Orthogonalization