I wrote this little server control while I was working on custom control designers.
It lets you scribble little figures, or sign your name.
WARNING: It runs very slowly on my web host, your mileage may vary.Scratch that, it only ran slow when it returned GIFs, its pretty fast with jpegs. The code has been updated.
Click here to try it out: http://www.johnsample.com/websketch/
Here's a picture I drew with it:
You can download the DLL here: http://www.johnsample.com/websketch/websketch.zip
To use it, add it to your toolbox in VS.NET and drag it onto a form. You need to use flow layout, it doesn't support absolute positioning yet.
There are only a few properties you need to worry about:
Image (lets you access and save the image thats being drawn)
Reset (clears the image)
Its still a work in progress, there are many more features to add. I'll put the updates here when I have them.