
I recently purchased both
Appigo's "Todo" iPhone app (for $9.99) and
Toodledo's Pro account (for $14.95/yr) which offers advanced features over the free account that were important to me. However, the free account itself is pr

etty spectacular, in the sense that every other web-based backend that works with an iPhone app charge you a yearly fee, and generally over $24.99/yr (which is what
Remember The Milk charges for the account that works with its iPhone app or
Appigo's Todo)! You, personally, may never need anything more than the free account from
Toodledo, but I like what the Pro account offers in conjunction with what
Appigo's Todo application offers with such grace and ease in their iPhone app. The most important to me being subtasks to create "projects" and "checklists", both which *require* sub-tasks (in all honesty,
Toodledo can still handle this in the free version, but the subtasks show up as regular tasks. For you, it may not matter, but I like seeing where they are associated and also be able to hide them to remove the clutter). To demonstrate this, I suggest that you visit
Appigo's site and watch some of the screencasts. It helped me better understand what the capabilities are, and is partially what sold me on this iPhone app over others. I also first downloaded the
Appigo Todo Lite app, which is free, signed up for the free account at
Toodledo and upgraded to the free 7 day trial of the
Toodledo Pro account to check it all out together. The
Todo Lite app only allows 10 tasks total, but it was enough for me to see the benefits over other solutions out there. By the way, checklists and projects seem to be considered 1 task for the limitation, but there is also a limit of about 5 subtasks for these in the lite version (NOT in the full version).
I suppose I should give a little background on my situation regarding task management so you can better understand what I was looking for in a system. I've read