By creating a Custom HTML module with an image in it and projecting it to the sitelogo position, you can project a company logo or similar in the header, like you see here on the top left and top right.
The image you enter in the module goes in a normal paragraph (<p> tags), so no worries when you use a WYSIWYG editor for your custom module. The alignment you give to the image determines whether it will project left, right or center.
For the RDC Web Design logo a 200x200px png image is used, which is automatically scaled down by the template.
The alignment from the top can be adapted in the stylesheet by adjusting the negative top margin value in: #sitelogo