diff -r 795c26a59016 dwm.h
--- a/dwm.h	Sun Aug 26 12:54:20 2007 +0200
+++ b/dwm.h	Wed Sep 05 20:49:43 2007 -0400
@@ -77,6 +77,7 @@ extern char stext[256];				/* status tex
 extern char stext[256];				/* status text */
 extern int screen, sx, sy, sw, sh;		/* screen geometry */
 extern int wax, way, wah, waw;			/* windowarea geometry */
+extern double* mwfact;
 extern unsigned int bh, blw, bpos;		/* bar height, bar layout label width, bar position */
 extern unsigned int ntags, numlockmask;		/* number of tags, numlock mask */
 extern void (*handler[LASTEvent])(XEvent *);	/* event handler */
diff -r 795c26a59016 main.c
--- a/main.c	Sun Aug 26 12:54:20 2007 +0200
+++ b/main.c	Wed Sep 05 20:49:43 2007 -0400
@@ -20,6 +20,7 @@ unsigned int bh, ntags;
 unsigned int bh, ntags;
 unsigned int bpos = BARPOS;
 unsigned int numlockmask = 0;
+double* mwfact;
 Atom wmatom[WMLast], netatom[NetLast];
 Bool *seltags;
 Bool selscreen = True;
diff -r 795c26a59016 screen.c
--- a/screen.c	Sun Aug 26 12:54:20 2007 +0200
+++ b/screen.c	Wed Sep 05 20:49:43 2007 -0400
@@ -178,6 +178,9 @@ initlayouts(void) {
 		if(w > blw)
 			blw = w;
 	}
+	mwfact = emallocz(ntags * sizeof(double));
+	for(i = 0; i < ntags; i++)
+		mwfact[i] = MWFACT;
 }
 
 Bool
diff -r 795c26a59016 tile.c
--- a/tile.c	Sun Aug 26 12:54:20 2007 +0200
+++ b/tile.c	Wed Sep 05 20:49:43 2007 -0400
@@ -1,31 +1,34 @@
 /* See LICENSE file for copyright and license details. */
 #include "dwm.h"
 #include <stdio.h>
-
 /* static */
 
-static double mwfact = MWFACT;
 
 /* extern */
 
 void
 setmwfact(const char *arg) {
 	double delta;
+	int i;
 
 	if(!isarrange(tile))
 		return;
+
 	/* arg handling, manipulate mwfact */
+	for(i = 0; i < ntags; i++)
+		if(seltags[i]) break;
+
 	if(arg == NULL)
-		mwfact = MWFACT;
+		mwfact[i] = MWFACT;
 	else if(1 == sscanf(arg, "%lf", &delta)) {
 		if(arg[0] != '+' && arg[0] != '-')
-			mwfact = delta;
+			mwfact[i] = delta;
 		else
-			mwfact += delta;
-		if(mwfact < 0.1)
-			mwfact = 0.1;
-		else if(mwfact > 0.9)
-			mwfact = 0.9;
+			mwfact[i] += delta;
+		if(mwfact[i] < 0.1)
+			mwfact[i] = 0.1;
+		else if(mwfact[i] > 0.9)
+			mwfact[i] = 0.9;
 	}
 	arrange();
 }
@@ -37,9 +40,11 @@ tile(void) {
 
 	for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
 		n++;
+	for(i = 0; i < ntags; i++)
+		if(seltags[i]) break;
 
 	/* window geoms */
-	mw = (n == 1) ? waw : mwfact * waw;
+	mw = (n == 1) ? waw : mwfact[i] * waw;
 	th = (n > 1) ? wah / (n - 1) : 0;
 	if(n > 1 && th < bh)
 		th = wah;