This is one of the best reviews I’ve seen in a long time.
I work for Apollo, http://www.apollohq.com and reading this review was an inspiration.
(BTW Apollo is not quite in the same scope as it covers project management, CRM, calendar, timers, etc.)
While we are very strong in terms of group-oriented project management, we are working on improving our “My tasks” section and how GTD we are. This article was great as it gave us an opportunity to really realise what we need to do.