The newest V2s and BEs have a Vizplex screen. Older V2s (and BEs?) and the V1 had a 1st generation screen. There is little difference in routine use, although the 1st generation screen can get washed out by direct sunlight during page refresh. The Wacom is the same on all of them.
The iLiads take notes by scribbling and the PRS-700 via a virtual keyboard. There have been reports of a Sony due out this year with a 9.7" screen (like that on the Kindle DX), see
Sony with larger-screen e-reader this year, no color before 2010.