<snippet>
	<content>
		<![CDATA[
background-color: ${1:top};
background-image: -webkit-gradient(linear, left top, left bottom, from(${1:top}), to(${2:bottom})); /* Saf4+, Chrome */
background-image: -webkit-linear-gradient(top, ${1:top}, ${2:bottom}); /* Chrome 10+, Saf5.1+, iOS 5+ */
background-image:    -moz-linear-gradient(top, ${1:top}, ${2:bottom}); /* FF3.6 */
background-image:     -ms-linear-gradient(top, ${1:top}, ${2:bottom}); /* IE10 */
background-image:      -o-linear-gradient(top, ${1:top}, ${2:bottom}); /* Opera 11.10+ */
background-image:         linear-gradient(top, ${1:top}, ${2:bottom});
filter: "progid:DXImageTransform.Microsoft.Gradient(startColorstr=${1:top}, endColorstr=${2:bottom})";
-ms-filter: "progid:DXImageTransform.Microsoft.Gradient(startColorstr=${1:top}, endColorstr=${2:bottom})";
		]]>
	</content>

	<tabTrigger>gradient</tabTrigger>
	<scope>source.css</scope>
	<description>Cross-browser vertical linear gradient</description>
</snippet>

Snippet for Sublime Text 2 with variables for the top and bottom colors. Just tab between them.

Cross-browser Linear Gradient for Sublime Text 2

CSS