I agree whole-heartedly. It is good that his Nibbana Sermons are now available online in English, but also rather unfortunate that they have seemingly not been published in book form, because they deserve to be!
Given that I prefer reading off paper so that I can read on public transport, I had to resort to printing them out, hole punching them, and putting them in a ring-binder. Even now if they were printed properly in book form, I wouldn't hesitate to purchase them. They are truly excellent, and venerable Nanananda's teachings are a shining beacon of light.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine