The latest nightly (v378) of the K2 theme for WordPress (which blogan.net currently uses) changes the CSS selectors for a triple column layout from sidebar-dual to columns-three.

Blogan.net now uses the following CSS in its custom CSS file to display both sidebars display on the right:

/* Page Layout */

h1 { padding-top: 5px; }

.columns-three #page {
	width: 950px;
	padding: 0;  
	border: 0px solid #333;
	border-top: none;
	clear: both;
	}

* html .columns-three #page {
	width: 952px; /* for IE5 and IE6 in quirks mode */
	w\idth: 950px; /* for IE6 in standards mode */
	}

#page {
	margin-top: 10px;
	border-top: 0px solid #333;
}

.columns-three .content {
	padding: 0;
	overflow: hidden;
	}

.content {
	border-bottom: 1px solid #888888;
	}

.columns-three #primary {
	margin-left: 0; /* override style.css */
	float: left;
	width: 499px;
	padding: 20px 25px 20px 25px;
	overflow: hidden;
	border-right: 1px solid #888888;
	}

* html .columns-three #primary {
	width: 550px; /* for IE5 and IE6 in quirks mode */
	w\idth: 499px; /* for IE6 in standards mode */
	}

.columns-three #sidebar-main {
	float: left;
	width: 210px;
	padding: 10px 10px 10px 20px;
	overflow: hidden;
	}

* html .columns-three #sidebar-main {
	width: 240px; /* for IE5 and IE6 in quirks mode */
	w\idth: 210px; /* for IE6 in standards mode */
	}

.columns-three #sidebar-alt {
	float: right;
	width: 125px;
	padding: 10px 25px 10px 10px;
	overflow: hidden;
	left: 0; /* override style.css */
	margin-left: 0; /* override style.css */
	}

* html #sidebar-alt {
	width: 160px; /* for IE5 and IE6 in quirks mode */
	w\idth: 125px; /* for IE6 in standards mode */
	}

#s {width: 70%; }

I also updated the K2 Community Forums with this information.