Mark's suggestion is a pretty good one, but at risk of being a nitpicker, it could be improved upon.
The Q tag is meant for inline quotes, and the BLOCKQUOTE for, well, block quotes. In fact, the Q tag is intended as a replacement for quote marks, so that locale-appropriate quotes will be used (eg "" in the USA, and «» in France).
Although IE doesn't currently support it, there's a CSS way to do this. Style the blockquote tag something like this:
CODE
blockquote {
background-color : #FFFF99;
border : 1px solid black;
padding-bottom : 3px;
padding-left : 3px;
padding-right: 3px;
padding-top : 3px;
}
blockquote:before {
content: "Quote:"; display: block;
}