Here's a really useful bit of freeware...It's Desktop Calendar.
I've been using this for a couple of years now. It pretty much does what you see in the picture, provide a very simple and clear view of your commitments for the month. No fancy reminders or forms to fill out. Just right-click a date, add your appointment and that's it.
It's probably not enough for a lot of people but if you do fine with a wall calender and just want something to stick on your desktop, it's perfect.