A banner ad that can be placed in the header of many themes with a slight alteration to the CSS. Esp useful with the standard black bar theme used to customize other themes but it seems to work with others too. Original discussion here.

[[image class="top-banner" link="start" title=""]]

[[module css]]
#container {
  position: relative;
#content-wrap {
  /* !important is required for this to work, but I couldn't track down why */
  position: static !important;
.top-banner  {
    position: absolute;
    top: 10px;
    right: 4px;    /* switch this to left: 0 to position in top left corner */
    z-index: 200;
    width: 728px;
    height: 90px;