Try Basecamp. It's easy and very simple to use. In fact, it's very user-friendly. You can easily learn how the features work so you don't have to waste too much time on learning the tool.

You may also try Redmine. It is a flexible project management web application which includes gantt charts for a better representation of projects. There are more alternatives to project management software, you can check more of the list here: http://www.timedoctor.com/blog/2011/...e-alternatives It lists more than 40 tools with features compared with each other. You can check here which ones has the features that would best meet your preferences.