In general, sketches with Inkling will be accurate to within approximately +/- 0.1 inches (+/- 2.5 mm) in the main drawing area of an A4 page, and within (approximately +/- 0.2 inches (+/- 5.0 mm) at the edges of the page.
2.5mm is quite a large fuzz factor. Enough to make me think this could be great for very-rough sketching / outlining of a design, but not enough for replacing scanning / doing (essentially) OCR.
If you check out that review it shows that the product definitely needs to mature. I can't see the wacom one being used for professional purposes until they up the accuracy. I was going to buy one for my finance for her birthday (she has a cintiq but wanted something for the go) but decided it wasn't worth it.
On top of that inkling requires that device to help read from the paper which limits its usefulness some (for me at least).
Hopefully they improve on it because it's definitely an interesting approach to this problem.
It looks like Evernote is just using the dots to help remove the skew caused by taking pictures of a curved page. Anoto, Livescribe, et al. use the dots to capture the handwriting as it is being written - so their dot patterns have to be unique across each page. The way Evernote is using the dots is much more akin to how Google de-warps the pages of books it scans.
Except it seems that the dot pattern for Evernote would have to be much larger. I'm a heavy user of Livescribe pens, which are built on Anoto's paper, but the dots are so small that it takes a very close look to even see them. In this case, the dots have to be large enough to be seen by the application when using a cell phone camera.