Index: wp-content/themes/twentyten/style.css
===================================================================
--- wp-content/themes/twentyten/style.css	(revision 15793)
+++ wp-content/themes/twentyten/style.css	(working copy)
@@ -1095,6 +1095,9 @@
 	list-style: square;
 	margin-left: 1.3em;
 }
+.widget-area select {
+	max-width: 100%;
+}
 .widget_search #s {/* This keeps the search inputs in line */
 	width: 60%;
 }