For more information on all of the features, please visit the support page. There is an in-depth FAQ page there as well. If you have a feature request, please email support. Chances are very high that I will implement what you ask.
This app is a good replacement for the discontinued Quicken Online, specifically the bill tracking and forecasting features.
There is also a companion iPhone app that has been out there for a while. It also syncs with the desktop version. Please keep in mind that it is not two way sync, so you cannot make changes on both devices at the same time. Make sure you are using version 5.0 or greater of the iPhone app if you will sync.
This app is also for you if you simply need a bill tracking app. With this versatile app, you can mark bills as paid, search, view them in a calendar, view them in a list sorted by date, mark important bills so they pop up and much more.