well the tablets can be a good device. I just got one about 10 days before Win7 came out.
so far I like it.
writing recognition is amazingly good. my penmanship is really bad, like Dr. handwriting meets pre-school bad!
but it gets almost all my printing and writing i have done so far.
not sure about your annoation - are they powerpoint ?
I have not yet tried to edit powerpoint with my tablet....
but OneNote with a tablet would work really well. it will store ink and arrange clips from word and web pages and other stuff.
if a slide deck can go into OneNote then that would be the way to go i think.
reading a word file in slate mode is sweet.
screen res: they are trying to balance size, weight and battery time. most are screens almost the size of a std. sheet of paper (8.5x11inch)
and that kind of works well so far as i can see.
I have an HP TX2z with the large battery, a tad heavy but so far I like it.