Check out Agilent's new LC Column & Sample Prep Navigator. This online tool enables you to find an Agilent column or sample prep recommendation in four ways:
1) By entering a competitive column or sample prep product (for a comparable Agilent cross-reference);
2) By entering some information about your analysis (instrument type, sample type, pKa of sample, hydrophobicity of sample, etc.);
3) By compound look-up;
4) By USP code.

Try it at http://navigator.chem.agilent.com.