An author's website is a crucial marketing tool. It not only allows readers and other interested parties to head over to your site and check out the content, it enables you to secretly promote your work in various ways.
1) Blog Banners:
Have a blog, post interesting content regularly, and alongside the content, have banners for your publications. TIP: Professional looking banners!
2) Book Page:
Have a page with all your publications, and of course, links.
3) News Section:
Keep readers up to date with your latest releases, keep them informed, and this gives you an opportunity to mention your current releases also.
4) Samples and Teasers:
Offer your readers a sample page, where they can read some of your work for free. If you are doing your job right as an author, and give them an enticing section from one of your books, they'll head over and buy a copy.
5) Free Book with Newsletter Signup:
A great way to build your author platform, and get your work out there, as well as build your subscriber list! Gift them a free PDF book upon signing up to your newsletter. More than likely, they'll read the freebie, and head over to actually purchase your other books.
Entice them even more. Have a page where readers / reviewers have left excellent comments about either you as an author, or a book in particular.
7) Book Trailers Page:
A professional book trailer to advertise one of your publications is an excellent way to allure a potential reader.
8) Pop-up Promotion of Newsletter or Sale:
As they click on to your site, set it up so that after a minute or so, a pop-up brings to their attention, either your newsletter (with a freebie) or your latest release (which may be on sale - influencing a purchase!)
Search. Engine. Optimisation. Go to the settings of your site, and each individual page, and add tags to the site and each page. By doing this, you'll make your site more discoverable by engines searches. Thus increasing your potential for higher book sales.
There you have it. Utilize that website of yours!