No need for a printer, scanner, fax machine--or even a pen--to sign and send important documents anymore. New apps for mobile devices let you create a clear signature with just your finger.
SignNow
This app for the iPhone, Android, and iPad lets you upload a Word document or PDF from your phone's e-mail, camera, or Dropbox account and tap to insert your signature. You can sign with your finger or upload a saved signature. Copies of signed documents can be sent by e-mail or saved in the cloud.
Cost: Free
DocuSign Ink
This free app for the iPhone, iPad, and Android devices is similar to SignNow but touts extra document encryption, authentication of signers' identities, and an audit trail showing who signed, when, and where. The paid version, called DocuSign, also lets you send documents to multiple parties and create e-mail reminders.
Cost: Paid version, $14.99 and up