Today I'm implementing some of the long-planned features of hDot. First off you'll notice the vastly changed front page. This is the first step to allowing paid accounts.
The "my profile" block on the right now shows your daily bandwidth usage. All current accounts start with a 100MB daily quota, which goes up by 100KB every time someone views a page on the account. Hotlinked images and all file downloads will use up the quota. This is to bring more traffic into the site. Basically you'll have two options if you're a high-bandwidth user - Use hotlinked thumbnails to bring traffic in, or purchase additional quota.
The quota increase is permanent, and after a couple of weeks will be reduced to an amount based on your account level. Basically if you bring a lot of traffic into the site one time, you'll have a better bandwidth cushion for life.
Once all these features are implemented I'll be rolling out a paypal system for purchasing storage and bandwidth. Read on for an overview of available plans.