According to this link, http://www.infoanarchy.org/?op=displaystory;sid=2002/11/11/4183/2039, a new form of digital cash called "yodels" is being offered anonymously:

Thanks to developments in anonymous communication, such as Freenet and the invisible irc project, anonymous digital cash has become a reality. Yodel Bank is offering 'yodels' as a form of currency you can exchange with people who you've never met outside of anonymous means. For example, you could pay for some web design or a hosting service anonymously, play video poker with real anonymous money on iip, or make a donation to a charity without disclosing who you are. Yodel Bank is relatively new, but now that you can transfer money over IIP and Freenet, a real vibrant anonymous economy is springing up, and it's unclear how goverments will react to this 'private' banking. Also it remains unclear if an Assassination Politics service will arise due to these technologies.

Supposedly, then, this is cash which can be transferred anonymously via IIP or Freenet. Leaving aside the question of trusting an anonymous bank (trust takes time), the sticking point for ecash is how to transfer between yodels and other currencies. Without transferability, what gives yodels their value?

The author of Yodel Bank can be reached on IIP under the name yodel on #yodel. He claims to be fully anonymous to the world, and has purchased the domain name and hosting by using his currency. He understands that trust is something that takes time to develop in an anonymous bank. I definately suggest you give his service a try.

So Mr. Yodel purchased his domain name (what domain name?) and his hosting by using yodels. If someone is selling these services for yodels, that could provide a limited basis for giving the currency value. An additional comment suggests that more information can be found at the Freenet address SSK@Mt3s3k7PCEUzbNW6zeI2oyRT0jgPAgM/yodel//. This is a "Freesite" and you need the Freenet software installed to access it.