Task management is something most loathe but have to do to keep productive. Producteev, a previously web and iPhone app focused task management service has just launched a Mac app.
Producteev focuses on creating and managing tasks with the ability to connect those tasks with other people, other services and sync them to the web. You can create tasks in different categories, arrange them by due date, attach notes and files to them, and even comment on them.
You can set up alerts for deadlines and get notified through the app itself, Growl, the Menu bar or Dock icons, or even via email and Gcal with a little help from the web app. You can also apply customizable color coded labels to your tasks to help you differentiate them from one another, as well as "Star" them with a rating from one to five.
For an individual, Producteev could be a little over complicated for what you need unless you're a serious multi-level task manager. But for a team, Producteev allows you to share tasks, create and assign them to others (individuals and groups of people) and has the potential to make collaborative tasks just that little bit easier. Comments and file attachments allow adjustments and additions to a task, while everyone can monitor progress and pitch in if needed.
The Mac app portion of Producteev is free and so is an individual account with up to two users sharing workspaces. If you want more plans start at US$5 per month and reach up to $30 a month for unlimited users and 1.5 GB of file storage (with a two-week free trial).