The Cregle iPen appears to be the closest thing to a Wacom so far. Offering perfect palm rejection and a super fine tip, though sadly no pressure sensitivity. It's currently just a Kickstarter.com project, yet already promises support from some major art and note taking apps.
There is also the eFun aPen. This is a remarkably similar product to the iPen. However it currently only works with their own propriatary app.
It's interesting to note that both these pens are based on an earlier pen device which captured notes as you wrote them on paper. Just swapping out the ink cartridge and putting the sensor in an iPad attachment. I say this is interesting because Wacom actually makes a similar product... only their pen does have pressure sensitivity. It is certainly possible that Wacom could similarly adapt theirs to the iPad some point.
There is also the eFun aPen. This is a remarkably similar product to the iPen. However it currently only works with their own propriatary app.
It's interesting to note that both these pens are based on an earlier pen device which captured notes as you wrote them on paper. Just swapping out the ink cartridge and putting the sensor in an iPad attachment. I say this is interesting because Wacom actually makes a similar product... only their pen does have pressure sensitivity. It is certainly possible that Wacom could similarly adapt theirs to the iPad some point.
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