diff -r 53d98940cb04 config.def.h
--- a/config.def.h	Fri Jun 04 11:41:16 2010 +0100
+++ b/config.def.h	Sun Jun 06 22:48:32 2010 +0200
@@ -12,14 +12,16 @@
 static const unsigned int snap      = 32;       /* snap pixel */
 static const Bool showbar           = True;     /* False means no bar */
 static const Bool topbar            = True;     /* False means bottom bar */
+static const double defaultopacity  = 0.75;
@@ -52,6 +54,9 @@
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
 	{ MODKEY|ShiftMask,             XK_Return, spawn,          {.v = termcmd } },
+	{ MODKEY|ShiftMask,		XK_s,	   spawn,	   SHCMD("transset-df -a --dec .1") },
+	{ MODKEY|ShiftMask,		XK_d,	   spawn,	   SHCMD("transset-df -a --inc .1") },
+	{ MODKEY|ShiftMask,		XK_f,	   spawn,	   SHCMD("transset-df -a .75") },
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
diff -r 53d98940cb04 dwm.c
--- a/dwm.c	Fri Jun 04 11:41:16 2010 +0100
+++ b/dwm.c	Sun Jun 06 22:48:32 2010 +0200
@@ -58,7 +58,7 @@
 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
 enum { NetSupported, NetWMName, NetWMState,
-       NetWMFullscreen, NetLast };                      /* EWMH atoms */
+       NetWMFullscreen, NetLast, NetWMWindowsOpacity }; /* EWMH atoms */
 enum { WMProtocols, WMDelete, WMState, WMLast };        /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
@@ -179,6 +179,7 @@
 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 static void enternotify(XEvent *e);
 static void expose(XEvent *e);
+static void opacity(Client *c, double opacity);
 static void focus(Client *c);
 static void focusin(XEvent *e);
 static void focusmon(const Arg *arg);
@@ -816,6 +817,18 @@
 }
 
 void
+opacity(Client *c, double opacity)
+{
+	if(opacity >= 0 && opacity <= 1) {
+		unsigned long real_opacity[] = { opacity * 0xffffffff };
+		XChangeProperty(dpy, c->win, netatom[NetWMWindowsOpacity], XA_CARDINAL,
+				32, PropModeReplace, (unsigned char *)real_opacity,
+				1);
+	} else
+		XDeleteProperty(dpy, c->win, netatom[NetWMWindowsOpacity]);
+}
+
+void
 focus(Client *c) {
 	if(!c || !ISVISIBLE(c))
 		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
@@ -1104,6 +1117,7 @@
 	*c = cz;
 	c->win = w;
 	updatetitle(c);
+	opacity(c, defaultopacity);
 	if(XGetTransientForHint(dpy, w, &trans))
 		t = wintoclient(trans);
 	if(t) {
@@ -1539,6 +1553,7 @@
 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
 	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
+	netatom[NetWMWindowsOpacity] = XInternAtom(dpy, "_NET_WM_WINDOW_OPACITY", False);
 	/* init cursors */
 	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);