The less middleware compiles and serves *.less files as css. Less itself is not bundled with Connect, so you must have it installed and available to node.
connect.createServer([
{ provider: 'less', root: __dirname + '/public', match: /\.css$/ }
]);
root Root directory from which to serve sass. Defaults to CWD
match RegExp used to match request urls. Defaults to /\.less$/
--lessRoot