I maintain a comparison chart of iPhone task management apps. It's not very big yet, but I'm working on it.
I've updated the ratings of all apps currently in the chart.
I've also changed the presentation. I've also colour-coded the values in the chart, so its easier to get an overall sense how the apps compare. Red is "bad," yellow is "medium," and green is "good." This is, of course, all based on my analysis. Your milage may vary.
I note with interest that Taska seems to be the best, except for the bugs that seem to keep messing it up. Too bad there hasn't been any activity on that app since Sep 2010.
