You may want to look at Note To Myself by GP Apps for the iPhone. It allows you to set a default To: CC: and Subject: for email creation. I use it to send emails to my Toodledo account even more quickly than I can with the built-in Mail app.
Is there any way to turn off the website feature that switches the mouse cursor to a checkmark when I hover over a checkbox on a task? It's very confusing and terrible UI metaphor - when I hover over a task's checkbox, it looks like the task is checked, I don't know whether to click or not. If it was already checked, but I think it's just the hover cursor, if I click then it becomes unchecked.
This is trivial stuff - don't overcomplicate the simple checkbox!
I'm a recent convert to ToodleDo and I've got both the ToodleDo and ToDo apps on my iPhone. I can't see a way of filtering a Folder by Context in ToodleDo which kind-of defeats the point for me. It's not either/or it's both. ToDo enables me to filter by both Folder and Context at the same time, but doesn't have the Star functionality which I rather like as a daily review-and-go aid.