DocuSign is a Cloud based legally compliant eSignature service. DocuSign service provides an intuitive web, mobile and an API interfaces. DocuSign API allows an application to connect DocuSign service or embed parts of DocuSign user experience.
By connecting to DocuSign web services applications can create electronic signature transactions, retrieve electronically signed documents, get up to date status on outstanding envelopes and do other Create/Read/Update/Delete operations.
By embedding DocuSign interface applications can provide single-sign-on capability and insert signing or sending user experience into their applications.
DocuSign's embedded signing capability adds another powerful signature option, enabling a secure signature via e-mail, portal or other online access.See it live on the web
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Great SAaS product with a growing developer community. I say this based my experience with the great SDK and developer forum. Keep it coming DocuSign, it is only getting better!