Tasks is YAOTMP (yet another online task management product) but when I think back it may be that it was one of the first. It's a very well designed and functional task management program that appears to have all the features you could ask for:

• Tagging
• Hierarchical organization of tasks
• Mobile interface
  
• Prioritize
• Email reminders
• Task templates
• Ability to create tasks from e-mails
• Favorite tasks
• iCalendar and RSS support
• Notes
• File Uploads
• Multiple Task Edit
• Themes
• Auto-check for updates to both software and documentation

Tasks is not hosted; it is software that you download and install on your own web server. In my mind this is good and bad; the good is that you can control where you put it, so that you can ensure it ends up on a fast host that is not too popular. The bad is that you're responsible to maintain your installation yourself, which is something I'm less and less inclined to do these days. I personally don't want to be messing with the nuts and bolts of my task management system, I just want it to work. But clearly many people do want that level of control.

Tasks costs $29.95 USD to purchase, although there is a free trial available for 21 days via a hosted account. If you decide to continue using Tasks, they will send you your data along with the install files upon purchase. There is also a hosted version of Tasks called UseTasks, which costs $3.95 USD per month for the Personal edition.

I haven't yet had the opportunity to install and try Tasks, so if you have please drop us a note in the comments and let us know what your experience has been like.