What would make those tools suck less?
I like a lot of things about Nozbe.com but it is too slow and I cannot do anything with it using my phone. Also, the fact that you will have to pay according to how many "projects" you have is crazy.
I'm trying very hard to make sure there's no UI clutter. I'll show my results by April 30th.
#3 and #4 mean a desktop app. I may consider that in the future but right now, web only. Sorry.
By #2/6 do you mean using AJAX?