As a photography it is important to have a web presence where potential clients can find you and see your work. Other important functions that a photographer's web site can offer is a place for clients to review images from their photo sessions and even order prints. A few years ago you would have to have your website custom developed by a web designer and then hosted by a hosting company. For a photographer all of that could get very expensive and require your time to maintain which results in less time for you to do what produces income, making photographs.
In the past few years the phorography website hosting niche has been filled by several company's such as Smug Mug, PBase, Photoshelter and others. Bac in 2007 when I was looking for a hosting site for my gallery I chose Zenfolio because I prefered their gallery layout and the price was right, but Zenfolio fell short in many features such as slide shows, a home or splash page and it didn't allow for much customization beyound the prebuilt layout and color templates.
Well that has all changed. In January 2010 Zenfolio's latest release has greatly enhanced their site by now offering new functionality that allows photographers to use Zenfolio to host 100% of their web site for gallery presentations, client reviews, print fullfillment services and much more.
If you are looking for a photographer's web site hosting service I would strongly recommend Zenfolio.