http://dl.dropbox.com/u/3975850/Graph%20Example.pdf is the link to a file I created using CamScanner Free. With CamScanner Free you take a picture from within the application. It then lets you select an area of your picture to scan. It turns this into a pdf. You have the option to upload this to various cloud computing sites. I use dropbox for cloud computing.
If my WordPress app were working (EDIT: Strangely the app works over the 3G phone network, but not over wireless networks.) I could scan and post a blog entry without having access to a computer. I could choose to use the original picture inline, or the pdf as a link.
The reviews of CamScanner mention other iphone scanner applications. I may look at those if the prices are reasonable.