PDF annotation tools for the iPad Possible Duplicate:
  iPad PDF Reader with annotation support?  




I'm considering purchasing a PDF annotation app for the iPad; mostly something that allows me to highlight, add handwritten and typed notes, comments, etc.

I have three closely-related questions:


Does anybody know of a recent review of PDF annotation tools for the iPad / iPad 2?
Alternatively, does anybody have/know of a list of pros-and-cons of the different PDF annotation tools for the iPad? 
Does Adobe have any official application for the iPad? If not, is there are a reason why they don't?


Thanks!
I have just been using iAnnotate PDF it's very good for marking PDF's on the go. It's £6.99 in the UK app store. Not sure about the USA price.