I've never been a big fan of the Tasks app on BlackBerry. I've used it from time to time but never really commited. From the look of things, I won't have to worry anymore as BlackBerry 10 will be bringing a new tasks app dubbed BlackBerry Remember. A leaked image in the CrackBerry forums shows off BlackBerry Remember coming to BB10. If this leaked slide holds true, BlackBerry Remember will be taking over for the native Tasks app in BlackBerry 10.
Not only does BlackBerry Remember act as your to-do list, but it also allows you to "capture and organize content and ideas in a way that makes it easy to decide what to do next". You'll be able to add tasks from anywhere on the device and later move them into groups and projects in order to keep track of things. You can even sync tasks with Outlook calendar if that's your thing. Plus, there is always that Evernote integration.