Solo Practice

Well there is a product which is highly rated (I'm sure there are others) called Echosign.

Imagine:

• Type up fee agreement.
• Upload into EchoSign.
• Email agreement to other party through EchoSign.
• Other party gets the email and e-signs.
• EchoSign notifies you that it's your turn to sign.
• Once all signatures are in place, all parties get a fully signed PDF emailed to them. 

Your documents get saved in your account online, and you can instantly see
what is waiting on who to sign. You can also have stock agreements in
the system as forms that you prefill online before sending out. You
get to choose wether or not you sign each agreement. And there is an
option to print out the agreement, sign on paper, and fax into
EchoSign.

There's a free trial for 4-5 signatures. Give it a try with a friend as a test.

Sounds worth trying out to include in your arsenal of services to make life easier for the client. 
If you are concerned about legalities, Echosign addresses with a full FAQ on the topic.