Index: source/blender/blenkernel/BKE_node.h
===================================================================
--- source/blender/blenkernel/BKE_node.h	(revision 10901)
+++ source/blender/blenkernel/BKE_node.h	(working copy)
@@ -143,6 +143,7 @@
 
 void			nodeAddToPreview(struct bNode *, float *, int, int);
 
+void			nodeUnlinkNode(struct bNodeTree *ntree, struct bNode *node);
 struct bNode	*nodeAddNodeType(struct bNodeTree *ntree, int type, struct bNodeTree *ngroup);
 void			nodeFreeNode(struct bNodeTree *ntree, struct bNode *node);
 struct bNode	*nodeCopyNode(struct bNodeTree *ntree, struct bNode *node);
Index: source/blender/blenkernel/intern/node.c
===================================================================
--- source/blender/blenkernel/intern/node.c	(revision 10901)
+++ source/blender/blenkernel/intern/node.c	(working copy)
@@ -941,7 +941,7 @@
 /* ************** Free stuff ********** */
 
 /* goes over entire tree */
-static void node_unlink_node(bNodeTree *ntree, bNode *node)
+void nodeUnlinkNode(bNodeTree *ntree, bNode *node)
 {
 	bNodeLink *link, *next;
 	bNodeSocket *sock;
@@ -985,7 +985,7 @@
 
 void nodeFreeNode(bNodeTree *ntree, bNode *node)
 {
-	node_unlink_node(ntree, node);
+	nodeUnlinkNode(ntree, node);
 	BLI_remlink(&ntree->nodes, node);
 
 	/* since it is called while free database, node->id is undefined */
Index: source/blender/src/editnode.c
===================================================================
--- source/blender/src/editnode.c	(revision 10901)
+++ source/blender/src/editnode.c	(working copy)
@@ -500,6 +500,23 @@
 	}
 }
 
+/* returns 1 if one was found */
+static int node_get_active_viewer(SpaceNode *snode, bNode **actnode)
+{
+	bNode *node;
+	
+	for(node= snode->nodetree->nodes.first; node; node= node->next) {
+		if( ELEM(node->type, CMP_NODE_VIEWER, CMP_NODE_SPLITVIEWER)) {
+			if(node->flag & NODE_DO_OUTPUT) {
+				*actnode= node;
+				return 1;
+			}
+		}
+	}
+
+	return 0;
+}
+
 void snode_make_group_editable(SpaceNode *snode, bNode *gnode)
 {
 	bNode *node;
@@ -1334,6 +1351,43 @@
 	return 0;
 }
 
+/* in_out can be used to limit socket type to input or output */
+static int mouse_over_socket(SpaceNode *snode, int in_out, bNode **socknode, bNodeSocket **sockover) {
+	bNode *node;
+	bNodeSocket *sock, *tsock, *sockinsel= NULL, *sockoutsel= NULL;
+	float mx, my;
+	short mval[2];
+	
+	if(snode->edittree==NULL) return 0;
+	
+	getmouseco_areawin(mval);
+	areamouseco_to_ipoco(G.v2d, mval, &mx, &my);
+	
+	for(node= snode->edittree->nodes.first; node; node= node->next) {
+		for(sock= node->inputs.first; sock; sock= sock->next) {
+			if(sock->flag & SELECT) sockinsel= sock;
+		}
+		for(sock= node->outputs.first; sock; sock= sock->next) {
+			if(sock->flag & SELECT) sockoutsel= sock;
+		}
+	}
+	
+	if(find_indicated_socket(snode, &node, &tsock, in_out)) {
+		if(tsock==sockinsel) {
+			*socknode= node;
+			*sockover= tsock;
+			return SOCK_IN;
+		}
+		if(tsock==sockoutsel) {
+			*socknode= node;
+			*sockover= tsock;
+			return SOCK_OUT;
+		}
+	}
+	
+	return 0;
+}
+
 static int node_socket_hilights(SpaceNode *snode, int in_out)
 {
 	bNode *node;
@@ -2047,6 +2101,8 @@
 void winqreadnodespace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 {
 	SpaceNode *snode= spacedata;
+	bNode *actnode, *socknode;
+	bNodeSocket *actsock;
 	unsigned short event= evt->event;
 	short val= evt->val, doredraw=0, fromlib= 0;
 	
@@ -2181,6 +2237,26 @@
 			if(okee("Read saved Render Layers"))
 				node_read_renderlayers(snode);
 			break;
+		case VKEY:
+			if(mouse_over_socket(snode, SOCK_OUT, &socknode, &actsock)) {
+				if(node_get_active_viewer(snode, &actnode)) {
+					/* remove old connections of active viewer node. could handle better? */
+					nodeUnlinkNode(snode->edittree, actnode);
+
+					/* connect output socket to input of active viewer node */
+					nodeAddLink(snode->edittree, socknode, actsock, actnode, actnode->inputs.first);
+					
+					/* necessary end checks. some might be in vain though */
+					NodeTagChanged(snode->edittree, actnode);
+					ntreeSolveOrder(snode->edittree);
+					snode_verify_groups(snode);
+					snode_handle_recalc(snode);
+					
+					allqueue(REDRAWNODE, 0);
+					BIF_undo_push("Add link to active viewer");
+				}
+			}
+			break;
 		case DELKEY:
 		case XKEY:
 			if(fromlib) fromlib= -1;