Providing certain documents in Adobe PDF format has many advantages. The format is open, available on almost every platform, widely-used and the Adobe Acrobat Reader is installed on most consumer and business computers (PCs, Macs, etc.).
Yahoo! has agreed a deal with Adobe to serve contextual text ads in PDF documents.
The deal offers publishers an opportunity to monetise their PDF files and could provide a sizeable new audience for advertisers - Adobe claims that 90% of PCs have one of its readers.