diff -Naur dwm-4.5/config.h dwm-4.5-new/config.h
--- dwm-4.5/config.h	2007-09-22 09:11:13.000000000 +0200
+++ dwm-4.5-new/config.h	2007-10-08 13:22:05.322096203 +0200
@@ -51,6 +51,7 @@
 	{ MODKEY,			XK_Return,	zoom,		NULL }, \
 	{ MODKEY|ShiftMask,		XK_space,	togglefloating,	NULL }, \
 	{ MODKEY|ShiftMask,		XK_c,		killclient,	NULL }, \
+  { MODKEY,     XK_Tab,    viewprevtag,    NULL }, \
 	{ MODKEY,			XK_0,		view,		NULL }, \
 	{ MODKEY,			XK_1,		view,		tags[0] }, \
 	{ MODKEY,			XK_2,		view,		tags[1] }, \
diff -Naur dwm-4.5/dwm.c dwm-4.5-new/dwm.c
--- dwm-4.5/dwm.c	2007-09-22 09:11:13.000000000 +0200
+++ dwm-4.5-new/dwm.c	2007-10-08 13:20:48.322222876 +0200
@@ -184,6 +184,7 @@
 void updatesizehints(Client *c);
 void updatetitle(Client *c);
 void view(const char *arg);
+void viewprevtag(const char *arg);	/* views previous selected tags */
 int xerror(Display *dpy, XErrorEvent *ee);
 int xerrordummy(Display *dsply, XErrorEvent *ee);
 int xerrorstart(Display *dsply, XErrorEvent *ee);
@@ -218,6 +219,7 @@
 Bool otherwm, readin;
 Bool running = True;
 Bool *seltags;
+Bool *prevtags;
 Bool selscreen = True;
 Client *clients = NULL;
 Client *sel = NULL;
@@ -393,6 +395,7 @@
 	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 	XSync(dpy, False);
 	free(seltags);
+  free(prevtags);
 }
 
 void
@@ -1468,7 +1471,9 @@
 	compileregs();
 	for(ntags = 0; tags[ntags]; ntags++);
 	seltags = emallocz(sizeof(Bool) * ntags);
+	prevtags = emallocz(sizeof(Bool) * ntags);
 	seltags[0] = True;
+	prevtags[0] = True;
 
 	/* init appearance */
 	dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
@@ -1838,8 +1843,10 @@
 view(const char *arg) {
 	unsigned int i;
 
-	for(i = 0; i < ntags; i++)
+	for(i = 0; i < ntags; i++) {
+    prevtags[i] = seltags[i];
 		seltags[i] = arg == NULL;
+  }
 	i = idxoftag(arg);
 	if(i >= 0 && i < ntags)
 		seltags[i] = True;
@@ -1847,6 +1854,19 @@
 }
 
 void
+viewprevtag(const char *arg) {
+	unsigned int i;
+	Bool t;
+
+	for(i = 0; i < ntags; i++) {
+		t = seltags[i];
+		seltags[i] = prevtags[i];
+		prevtags[i] = t;
+	}
+	arrange();
+}
+
+void
 zoom(const char *arg) {
 	Client *c;