I've been using paper reward charts with my kids mostly successfully for a while now. I used to use a simple piece of paper, which was stuck on the fridge, with their names on it. When they completed a task successfully, I'd draw a star on the chart. The problem was that sometimes the piece of paper would get lost or I'd not be home and I couldn't give them their star. Often, I'd have to remember the stars I'd have to give them in my head, till I actually did it.
I looked online for a solution and I found a few of them. But most of them were cumbersome, involving dragging and dropping and huge graphics. I wanted something that was about as simple as paper. So, Kid Rewards was born. It's developed in web2py - an amazing web development framework, which focuses on getting things done quickly and nicely.
With Kid Rewards you can assign points or stars with one click, you can add a note if you like. You can assign more than one point a day. You can even take away points if necessary. You can stay logged in, so you don't have to login each time you visit the site. Click on a kid's name, see all their goals and their progress, and give them a point for each goal right there. Click on a goal and see a graph of the progress.
It's even tied to Amazon, so you can search for a reward easily and buy your kid a reward straight from Amazon. Amazon has a huge collection of toys and gifts for kids and excellent prices.