We all have busy lives with something always going on, and I use Google Calendar to try to keep track of all those events. I just can’t believe that they don’t have a nice task manager built into the Calendar yet. For that reason I haven’t been able to ditch my ReminderFox Firefox extension yet.
It has a huge list of customizable options for reminding you about events but the best thing is that you can keep track of your tasks as well. If tracking your tasks isn’t enough then maybe you would like the feature to create multiple lists such as for groceries, homework, or just about anything!
This isn’t exactly a full fledged calendar but it will keep you on top of things that you normally forget about. Sure we all like to think we’ll remember something but that doesn’t always work out…at least not for me. 
I might check this out. Been using Yahoo!Calendar but have recently switched over to [home.myway.com]
I put things on the calender, have a Firefox notifier and still forget to look at either of them.
I have been using ReminderFox for a month now with good results.