I agree, I think that a website is the number one way to close the deal. However I think a bad website is worse then not having a website or only having a splash page up. I personally like custom sites, but those can range from $2000+. A couple good yet inexpensive website companies (templates) are portfoliositez.com, bigfolio.com, and flashpalette.com. All of these come with admins that allow you to edit all your site content.
I think it is still really important to get your site seem in search engine's as well. The best way to do this is to get your link out on the web as many places as you can. Adding it to your signature in a forums, to any resource list in your area, or on sites such as the knot.com can help with this.
Another idea I think helps clients keep you in mind is having a blog. I've seen this done successfully (
http://www.boutwellstudio.com/blog/), however if it is not updated regularly it can be counter productive I think.
I also personally like sending out marketing material to those interested, mostly a tri-fold brochure or a full color postcard. The cheapest place I could find that I'm happy with is gotprint.com.