Somebody asked here about Repligo PDF Reader, in its version for Android 2.2.

I already had installed a Repligo for Android 1.6 with Dingo which worked fine as a PDF Reader, but this version did not allow PDF annotation, underlining, sticky notes (much like those of Acrobat), etc.

So the first thing I did after upgrading to Ermine was installing Repligo Reader for Android 2.2 and testing it.
So far, it works well. Installation ran smoothly, no problem at all, then all functions were there.
I used them all in a PDF file and it went okay.

So for those who needed PDF annotation in the Tablet side of the Edge, you can use Repligo Reader, which is a great program.