I can appreciate the time it takes to create and develop a perfect product but there are times when it's important to just get it on the street.
Omnifocus - is a wonderful concept and a welcome if not crucial development in the world of GTD applications.
ThinkingRock - was "the leader" because it stuck to the GTD paradigm and was multi-platform but it seems to have fallen back a bit because of the slow development cycle.
http://www.thinkingrock.com.au/
iGTD - attracted and continues to attract more attention and is building a sizeable user base because of the developer's response to user input and the speed of development.
http://bargiel.home.pl/iGTD/14beta/index.html
Actiontastic - has taken a minimalist approach that some people like but is also very slow in its development cycle possibly complicated by its intention to link to a web site. (last post 2007/03/15)
http://www.kaboomerang.com/blog/category/actiontastic/
So where are "we" poor GTD afficionados today in our "quest" for the perfect GTD application?
It seems most serious GTD people are eager to give Omnifocus a shot when it arrives but are in the mean time are using iGTD to get results unless we've a prior committment to Kinkless.
http://wiki.43folders.com/index.php/Kinkless_FAQs
The new GTD adopters I come into contact with daily - a group of nearly 100 - are growing more and more frustrated with the wait.
Ueila