I'm a big fan of Toodledo. I started out as an online user. Now I use it on my iPhone with Todo, Toodledo slim and Toodledo. I love it.
My suggestion is for the Toodledo iPhone app. Say I'm looking at All Tasks sorted by folder. I'd like to see a separator at each folder change just like you have on the website. Reading the folder name or the priority, however you have it sorted, is to hard.
But sorting is not enough...
I'd also like to be able to GROUP the list by folder or context or due date or whatever. Say I'm looking at All Tasks again. I want to group tasks by folder and then sort each group alphabetically. Or group by Context and sort by Due Date. Again, the group separator is essential here.
Thank you for all your hard work on this application. I think it's wonderful that you provide this free application for free online. I've told many iPhone and iPod users about it. Please keep up the good work!