In our experiments we investigate the dynamics of superfluids confined in a narrow channel. In single-component BECs, dark and bright solitons, forming local density suppressions and local bumps in the density, respectively, have attracted great interest. We recently extended our studies to two-component BECs, in which the dynamics are even richer as a new degree of freedom, namely the relative flow between the two components, is introduced. As our experiments show, a counteflow-induced modulational instability plays a key role in determining the observed dynamics and can be exploited to generate interesting soliton structures including dark-bright soliton trains as well as beating dark-dark solitons. Current and ongoing research will be discussed.