[Jorge Stolfi]

Idle curiosity: what interesting *aprotic* polar solvents are there?  Interesting could mean being able to usefully dissolve a large number os salts, or some salts that are insoluble in water, or some substances that are decomposed by protic solvents such as water and ethanol, etc. 

[fledarmus]

The most useful I've found are N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, and N-methylpyrollidone