What's the best GTD app for iPhone?

Great question. I just use the Notes app as a capture tool. The rest of my system is in a Word doc on my computer, which I’m near enough often enough.
I also use Google calendar, which I leave open on my iphone as a permanent window. That’s most useful when I have a call scheduled – I just look it up on my g-cal and hit “call.”

I really like ta-da lists. don’t have the URL
handy but if you google it you’ll find it quick

I use gcal, notes on my iPhone, and things on my mac. I love things.

I use Remember The Milk for mine. Not specifically GTD but works well for it. Web based so can access anywhere and has a good iPhone interface, this is one of the added extras for pro accounts but thats only $25 for a year I believe. You can try the iPhone interface for maybe 15 or 30 days (can’t remember which) for free to see if you like it.

Thx. RTM looks great!

how about Nozbe. free and web based so it’s available wherever you have internet access. There’s an iPhone version.

I use Things, which I think is great. My old trusted system was a homebrew web based app which I made. Between Things and the iPhone Calendar I pretty much have everything I need right on the iPhone.

One thing that was missing was a way to store the kind of recurring tasks that I don’t do at a specific time, but I want to do regularly. Tasks like going to the gym every 2 to 3 days, calling my Mom every weekend or cleaning up a little every other day or so. I don’t want to clutter my calendar with these (I have a lot). Also, I’d like to know how I did with them over time (% early/late). Anyway, I had this in my homebrew system and missed it, so I ported over to the iPhone—it’s called Habits. You can see more here:

http://loufranco.com/habits

Strong second for Things. Things and Omnifocus are by far the most full-featured apps that currently have an iPhone client that syncs with a desktop client. Things wins not only because of a better interface but because the syncing just requires a local (ad-hoc) wifi connection—not a syncing service like WebDav or MobileMe.

After a number of months, I’m now migrating from Things to RTM. Things was pretty, but the syncing was awkward, and it couldn’t share between other users. RTM seems more powerful, and still clean and simple. Slightly different metaphor, but I’m liking it.

I am using MyProjects from, Avellana Software, http://www.avellanasoftware.com, and I am pretty happy about it.