Put your website on everything. It should be on anything you print. All of you advertising should contain your url. You can get specialty items made with your url.
Your website is a powerful tool that can amplify everything else you do. You just need to make a conscious effort to include your url whenever possible.
Note: When you print your url use capitalization to make it easier to distinguish the individual words. For example justinswebdesign.com isn’t as easy to remember as JustinsWebDesign.com.