I would like to develope a private Toodledo Desktop Client that fits my needs. (Kind of gadget)
I would like to register for an AppID, but I've got no website I could link to.
Is it possible to get an AppID without a website?
If it is just for private use, you can put a fake or random website in there. If you ever decided to release it publicly, we would require a valid URL where people could find out more about your product.