I actually meant for 'critical' plugin updates to get the red tint, not bugfix releases. Doh!
--- trunk/htdocs/system/admin/css/admin.css 2010-11-19 12:58:40 UTC (rev 4595)
+++ trunk/htdocs/system/admin/css/admin.css 2010-11-20 02:48:35 UTC (rev 4596)
@@ -1047,7 +1047,7 @@
margin-bottom: 15px;
}
-#page .dashboardinfo .updates .update a.bugfix {
+#page .dashboardinfo .updates .update a.critical {
color: #aa0000;
}