electronic contracts and consent forms

I often work with usability test participants and freelance clients
whom I never meet face to face. I avoid contracts, consent forms, and
NDAs whenever possible because it's such a hassle to print and
scan/fax them over and over in order to get everyone's signature on
them.

Is there an easy (for the participant/client, especially) means of
signing contracts electronically, one that stands up at least fairly
well in court?

I've started reading about this, and a lot of what I'm finding has to
do with PGP-like key exchanges and signature passwords, neither of
which sound like something I could quickly and easily explain to a
user or customer. If the signing process is cumbersome, it tends to
taint the rest of the experience.

Any advice, pointers, or experiences anyone could share?

Thank you!
Andrew Simchik
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