SmoothBoosh is a great HTML/CSS theme, which can be used for many different types of sites such as portfolios, business, personal ect. This theme comes with a whole host of different options so that you can customize it to suit the needs of the site you are catering for.
Features
Valid XHTML
Well commented and clean CSS / XHTML Files
Multiple colour options
Font Replacement (cufon)
jQuery Drop-down menu
jQuery Slider (nivo or coin)
Image Preloader
Portfolio Gallery with quicksand filter option
Lightbox (prettyPhoto) support with images and videos
