CSS3

Rounded corners

input {
  border-radius: 5px;
  -moz-border-radius: 5px;
  -webkit-border-radius: 5px;
}

Box Shadow

#content {
  -moz-box-shadow: 5px 5px 5px #ccc;
  -webkit-box-shadow: 5px 5px 5px #ccc;
  -o-box-shadow: 5px 5px 5px #ccc;
  -box-shadow: 5px 5px 5px #ccc;
}

Text Shadow

#content {
  text-shadow: 2px 2px 2px #ccc;
}

Rotations

#content {
  -moz-transform: rotate(-2.3deg)
  -o-transform: rotate(-2.3deg)
  -webkit-transform: rotate(-2.3deg)
  -ms-transform: rotate(-2.3deg)
  -transform: rotate(-2.3deg)
}

Transparency

#content {
   background-color: rgba(255, 255, 255, 0.80)
}

Striped tables

tr:nth-of-type(even) {
  background-color: white;
}

tr:nth-of-type(odd) {
  background-color: black;
}

Last line bold

tr:last-child {
  font-weight: bolder;
}

Two column content

#content {
  -moz-column-count: 2;
  -webkit-column-count: 2;
  -moz-column-gap: 20px;
  -webkit-column-gap: 20px;
}