I was quite surprised to realise that I have actually aquired three of the adventures in the list (not bad at all, given that I have distanced myself from the genre lately). Specifically: bought
Dreamfall and
Scratches at opening price and won
Keepsake in a local Internet site contest. Only played
Dreamfall so far, however.
Usually, I tend to wait a few months in order to get my adventures cheaper (yet still new) but I seem to have disobeyed that tradition this year. Depending on the reviews, which will probably soon flood the Internet, and my budget, I might also consider getting
Secret Files: Tunguska before the year is out.
(Edit)
PS: Besides
Al Emmo, I believe you also failed to include
Secrets of Da Vinci: The Forbidden Manuscript, and
Safecracker (puzzle, I know, but still) in the list.