Index: RController.h
===================================================================
--- RController.h	(revision 795)
+++ RController.h	(working copy)
@@ -115,7 +115,10 @@
 	
     BOOL runSystemAsRoot;
 	BOOL busyRFlag;
+	BOOL growlIsAvailable;
 	
+	NSDate *computationStarted;
+	
 	float currentSize;
 	float currentFontSize;
 	float currentConsoleWidth;
Index: RController.m
===================================================================
--- RController.m	(revision 795)
+++ RController.m	(working copy)
@@ -47,6 +47,10 @@
 #import "ColorsPrefPane.h"
 #import "EditorPrefPane.h"
 
+#import <GrowlAppBridge/GrowlApplicationBridge.h>
+#import <GrowlAppBridge/GrowlDefines.h>
+
+
 // size of the console output cache buffer
 #define DEFAULT_WRITE_BUFFER_SIZE 32768
 // high water-mark of the buffer - it's [length - x] where x is the smallest possible size to be flushed before a new string will be split.
@@ -127,9 +131,12 @@
 	readConsTransBufferSize = 1024; // initial size - will grow as needed
 	readConsTransBuffer = (char*) malloc(readConsTransBufferSize);
 	
+	growlIsAvailable = NO;
+	
 	return self;
 }
 
+
 - (void) setRootFlag: (BOOL) flag
 {
 	if (!flag) removeRootAuthorization();
@@ -250,6 +257,8 @@
 	//currentFontSize = [[RTextView font] pointSize];
 	currentConsoleWidth = -1;
 	chdir(R_ExpandFileName("~/"));
+
+	
 }
 
 -(void) applicationDidFinishLaunching: (NSNotification *)aNotification
@@ -287,9 +296,33 @@
 												 selector:@selector(runRELP:)
 												 userInfo:0
 												  repeats:NO];
+
 	
+	
+	/* Check for Growl notification helper app and activate it if available */
+	if(NSClassFromString(@"GrowlAppBridge") != nil &&
+	   [NSClassFromString(@"GrowlAppBridge") launchGrowlIfInstalledNotifyingTarget:self
+																		  selector:@selector(growlDidLaunch:)
+																		   context:nil]) {
+	} else
+		NSLog(@"Unable to locate or load GrowlAppBridge framework");
+	
 }
 
+- (void) growlDidLaunch:(void*)context {
+	growlIsAvailable = YES;
+	/* Register ourselves with Growl */
+	[[NSDistributedNotificationCenter defaultCenter]
+		postNotificationName:GROWL_APP_REGISTRATION
+					  object:nil
+					userInfo:[NSDictionary dictionaryWithObjectsAndKeys:
+						@"R",GROWL_APP_NAME,
+						[NSArray arrayWithObject:@"ComputationCompleted"],GROWL_NOTIFICATIONS_ALL,
+						[NSArray arrayWithObject:@"ComputationCompleted"],GROWL_NOTIFICATIONS_DEFAULT,
+						nil]];
+}
+
+
 -(void) addConnectionLog
 {
 	NSPort *port1;
@@ -1105,10 +1138,31 @@
 }
 
 - (void) handleBusy: (BOOL) isBusy {
-    if (isBusy)
+    if (isBusy) {
+		computationStarted = [[NSDate date] retain];
         [progressWheel startAnimation:self];
-    else
+    } else {
+		if(computationStarted != nil && growlIsAvailable == YES && [[NSApplication sharedApplication] isActive] == NO) {
+			NSNumber *seconds = [[NSUserDefaults standardUserDefaults] objectForKey:@"SecondsUntilNotification"];
+			if([[NSUserDefaults standardUserDefaults] boolForKey:@"ShouldSendGrowlNotification"] &&
+			   seconds &&
+			   [seconds floatValue] <= -[computationStarted timeIntervalSinceNow]) {
+				[[NSDistributedNotificationCenter defaultCenter]
+				postNotificationName:GROWL_NOTIFICATION
+							  object:nil
+							userInfo:[NSDictionary dictionaryWithObjectsAndKeys:
+								@"R",GROWL_APP_NAME,
+								@"ComputationCompleted",GROWL_NOTIFICATION_NAME,
+								@"R",GROWL_NOTIFICATION_TITLE,
+								@"Computation Complete",GROWL_NOTIFICATION_DESCRIPTION,
+								nil]
+				  deliverImmediately:YES];
+			}
+		}
+		[computationStarted release];
+		computationStarted = nil;
         [progressWheel stopAnimation:self];
+	}
 	
 	busyRFlag = isBusy;
 	if (toolbarStopItem) {