The bit about things looking fuzzy or whatever if you magnify is rubbish. It's true, for example, for a picture scanned at a set dpi. It's not true for Word or Firefox/IE (try it right now on your browser: ctrl key + mouse wheel to zoom in).
I am only repeating what the Lenovo customer rep told me, but she said she uses both types of screens WXGA+ and WXGA on T61s. Her feelings were that when working with Excel and Word documents, with WXGA+ the numbers/words were small and more difficult to read. That you could of course make them larger, but then the image/letters/numbers/lines were not as clear or "defined". She had been or was (can't recall) a graduate student and she said this was something she was particularly sensitive of. She felt the WXGA+'s strengths were in graphics not text.
Again I don't have any personal experience with these screens, but it had me questioning what to do which is why I am curious about other people's experiences. I know I have seen Dell's D420 (12" screen) and while a very nice little laptop, the native text and image size would not be pleasant to be staring at for long periods of time each day. True, it can be made larger, but it does come at the expense of clarity (crispness). I was hoping this was not the case with the WXGA+ screen...thus my curiosity regarding other people's personal experience with these screens.