E-signing question (technical expertise requested)

My spousette asked me if the Teeming Millions could help her out with this:
“I work for a company that needs to implement having customers e-sign their loan applications. What brilliant doper out there can tell me what this might entail and the easiest/ most cost effective way to do it?”

Any help anyone might be able to offer would be most appreciated! :).

Have her look around VeriSign.