[EbokJunkie]

Have you noticed that Nook 1.4 doesn't support highlighting, notes and dictionary for pdf files?
Have you noticed how access to built-in dictionary is implemented in Nook 1.4 for epub files?
First, one needs to get to the word he/she wants to look up. Cursor lazily moves between words, sometimes it stucks, sometimes jumps. Look-up process is slow but finally word found and you see the dictionary entry. Wow, the entry is smallish text on dark grey background. Can you select bigger font? No, you cannot.
Ok, let's close the dictionary and try to look up for the next word. Imagine that you inadvertently passed beyond the page bottom. Where is your cursor? Anywhere. Sometimes it gets not in front of the word (normal position) but behind the word. In this case Nook tries to look up for the neighbor.

Dictionary look-up in Sony 900 is provided by double tap of your finger on selected word. This is a direct access to text which Nook will never grant you because LCD touch-up screen is separated from text.
Look-up is fast and you have option to expand found entry to full page and browse your dictionary (actually, you have two Oxford dictionaries available).

The bottom line: If research work with pdf books is important for you remember that currently Nook is grossly impaired in this area; if research with epub is important for you Nook 1.4 still falls behind Sony 900 in convenience.

BTW, just try to work with Nook in open air under daytime sun. All advantages of e-ink screen are killed by darkish blind LCD screen.

Also, may be your vision is not perfect and you prefer to increase your reading fonts? Sure, you can do this with Nook.
Well, but what about the LCD screen? Font is too small for you? Sorry, you are out of luck, you got what you paid for.

So, you like Nook better than Sony PRS-900... Just think twice before committing yourself.