Recently a lot of work was done in exploiting browsers cross site scripting (XSS) vulnerabilities.
Now research by Aaron Weaver showed the possibility to use browser connected to malicious site to send print jobs to network printers. This may be big problem for companies – usually home users use only locally connected printers.
It is just matter of time to create a tool and sell it to the spammers. Then we can say welcome to “printer” spam.