Started with Onepoint Project Basic one or two months ago and I have to say that it is really easy to use. What I also like is that it's not just about planning, I mean it's not just a GANTT chart drawing app: instead it includes also basic controlling tools such as e.g. plan/actual comparisons of resources and costs. And BTW, it also looks cool... :-)
I agree with the other two reviewers, it is basically just a GANTT chart drawing app. Although I think it's not so bad at this, certainly not MS Project, but still. If you are looking for "real" project management stuff you might want to take a look at Onepoint Project. I compared it to GanttProject and OpenProj and selected it a few weeks ago and so far it lives up to my expectations, let's see... :-)