diff -rup dwm-5.9-orig/config.def.h dwm-5.9/config.def.h
--- dwm-5.9-orig/config.def.h	2011-07-10 22:24:25.000000000 +0200
+++ dwm-5.9/config.def.h	2011-08-17 17:15:47.000000000 +0200
@@ -17,9 +17,10 @@ static const Bool topbar            = Tr
 static const char *tags[] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
 
 static const Rule rules[] = {
-	/* class      instance    title       tags mask     isfloating   monitor */
-	{ "Gimp",     NULL,       NULL,       0,            True,        -1 },
-	{ "Firefox",  NULL,       NULL,       1 << 8,       False,       -1 },
+	/* class      instance    title       tags mask     isfloating   geometry            monitor */
+	{ "Gimp",     NULL,       NULL,       0,            True,        NULL,               -1 },
+	{ "Firefox",  NULL,       NULL,       1 << 8,       False,       NULL,               -1 },
+	{ "XCalc",    NULL,       NULL,       0,            True,        "225x333+200+100",  -1 },
 };
 
 /* layout(s) */
diff -rup dwm-5.9-orig/dwm.c dwm-5.9/dwm.c
--- dwm-5.9-orig/dwm.c	2011-07-10 22:24:25.000000000 +0200
+++ dwm-5.9/dwm.c	2011-08-17 17:19:07.000000000 +0200
@@ -148,6 +148,7 @@ typedef struct {
 	const char *title;
 	unsigned int tags;
 	Bool isfloating;
+	const char *geometry;
 	int monitor;
 } Rule;
 
@@ -290,6 +291,8 @@ applyrules(Client *c) {
 	const Rule *r;
 	Monitor *m;
 	XClassHint ch = { 0 };
+	int geomask, x, y;
+	unsigned int w, h;
 
 	/* rule matching */
 	c->isfloating = c->tags = 0;
@@ -307,6 +310,19 @@ applyrules(Client *c) {
 				for(m = mons; m && m->num != r->monitor; m = m->next);
 				if(m)
 					c->mon = m;
+				if(r->geometry) {
+					c->isfloating = True;
+					/* long version, so that it's possible to add some checks */
+					geomask = XParseGeometry(r->geometry, &x, &y, &w, &h);
+					if(geomask & WidthValue)
+						c->w = w;
+					if(geomask & HeightValue)
+						c->h = h;
+					if(geomask & XValue)
+						c->x = x;
+					if(geomask & YValue)
+						c->y = y;
+				}
 			}
 		}
 		if(ch.res_class)
@@ -1104,6 +1120,12 @@ manage(Window w, XWindowAttributes *wa)
 		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
 	c->win = w;
 	updatetitle(c);
+	/* geometry */
+	c->x = c->oldx = wa->x;
+	c->y = c->oldy = wa->y;
+	c->w = c->oldw = wa->width;
+	c->h = c->oldh = wa->height;
+	c->oldbw = wa->border_width;
 	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
 		c->mon = t->mon;
 		c->tags = t->tags;
@@ -1112,12 +1134,6 @@ manage(Window w, XWindowAttributes *wa)
 		c->mon = selmon;
 		applyrules(c);
 	}
-	/* geometry */
-	c->x = c->oldx = wa->x;
-	c->y = c->oldy = wa->y;
-	c->w = c->oldw = wa->width;
-	c->h = c->oldh = wa->height;
-	c->oldbw = wa->border_width;
 	if(c->w == c->mon->mw && c->h == c->mon->mh) {
 		c->isfloating = True;
 		c->x = c->mon->mx;