It seems some people still like to receive a fax now and then, so if you have an iPad, eFax has an app for that now.
If anyone wants to ever reduce the expense of faxing, all Google needs to do is add fax receive capability to GoogleVoice. While eFax/Jfax may hold some patents, Google is the kind of company that may just want to have it in their suite of services or inside Google Mail at some point to be able to offer a complete Unified Communications suite.