NoIdentity's ListBook (US$1.99) is a straightforward list compiler that looks great and has some well implemented features to help you get on top of all those lists and things to get done.
The universal app for iPhone and iPad lets you compile numerous lists and add items (or to-dos / tasks) to those lists. To create a list, add one and give it a title, like "groceries" or "personal," and categorize it by assigning one of 15 images to it, to help differentiate what kind of list it is.
Within a list, just pull down to add a new item to that list. This takes you to a detailed view of the item. The first line of text you enter becomse the title of that item. If you add more text on a new line, that appears as notes underneath the title of that item when viewed in its respective list.
Items can be assigned or tagged a specific color, to help identify certain items within a list. Items can also have reminders set by date and time as well as location based reminders, similar to Apple's Reminders app. So when you leave or arrive at a specific location you'll receive a reminder. Recurring reminders can also be set.
To complete, check or finish an item, just tap it and it is marked with a tick and becomes slightly faded, or you can set completed items in individual lists to be hidden.
There's no way to view all items in one list, but that's not the point of ListBook. ListBook is about making lists, categorizing them and helping you to remember to complete them.
Unfortunately there's no cross-platform syncing, which would be nice considering this is a universal app for iPad and iPhone. But if you're looking for a reminders / list app with a bit more flare and power than Apple's Reminders app, but no desire to dive into the depths of pro-organization, then ListBook is worth checking out.