If you have a good domain name that is short and catchy, it's pretty easy to put it on your car... I see them now and again. I've seen a few paint jobs on cars specifically for this purpose. But of course if your car sits in the driveway a lot it won't make much difference.
The good old business card! Give them out whenever you find yourself talking to someone who might have a need for the content/products on the your website.
Cold calling data with a non sale speech just to get them to know your product is there. Also pass the mail man some leflets and a $20 to post them.
Short Domain and easy memorize are good to use Offline marketing such as Free Services or any free stuff.
Signs and placards - stick them everywhere you can that won't get you fined. Also bumpper stickers, pens, etc... anything you can put your brand on and give away either free with each order or just give them out free at Fairs and stuff. Last I checked you don't need a permit to hand out stuff for free (unless you cause a disturbance). This free stuff works - why else would everyone from the Army and Navy to Ragu and Jack Daniels be willing to pay 100's of thousands of dollars for expensive display vehicles and promotions that only giveaway freebies? Because they get a huge response from this form of advertising.
Best of offline marketing techniques are: First of all you need a attractive, easy to type and remember domain name Business Cards Hoardings Banners TV Channels Radio Pemplate Local Business Magazines Newspapers Stickers
I think you should open a model shop or mobile shop with attractive name of your website like www.xxx.com. once a buzz will create people will attract to know about .com shop.
Business cards etc. are really good. If you can get some stickers and slap them over objects in public place that can also be useful. You kind of have to be careful of the legalities of these just because some may consider it vandalism.
A growing trend is reusable shopping bags get your logo number website and something catchy on it so people will remember. Then give it away at a fair or some type of event were potential customers and prospects will be then they will reuse the bag often. I am getting mine made soon