diff --git a/extra/alarms/alarms.factor b/extra/alarms/alarms.factor
new file mode 100644
index 0000000000..4842f8b7ae
--- /dev/null
+++ b/extra/alarms/alarms.factor
@@ -0,0 +1,87 @@
+! Copyright (C) 2007 Doug Coleman.
+! See http://factorcode.org/license.txt for BSD license.
+USING: arrays calendar combinators concurrency generic
+init kernel math namespaces sequences threads ;
+IN: alarms
+
+TUPLE: alarm time quot ;
+
+C: <alarm> alarm
+
+<PRIVATE
+
+! for now a V{ }, eventually a min-heap to store alarms
+SYMBOL: alarms
+SYMBOL: alarm-receiver
+SYMBOL: alarm-looper
+
+: add-alarm ( alarm -- )
+    alarms get-global push ;
+
+: remove-alarm ( alarm -- )
+    alarms get-global remove alarms set-global ;
+
+: handle-alarm ( alarm -- )
+    dup delegate {
+        { "register" [ add-alarm ] }
+        { "unregister" [ remove-alarm  ] }
+    } case ;
+
+: expired-alarms ( -- seq )
+    now alarms get-global
+    [ alarm-time <=> 0 > ] curry* subset ;
+
+: unexpired-alarms ( -- seq )
+    now alarms get-global
+    [ alarm-time <=> 0 <= ] curry* subset ;
+
+: call-alarm ( alarm -- )
+    alarm-quot spawn drop ;
+
+: do-alarms ( -- )
+    expired-alarms [ call-alarm ] each
+    unexpired-alarms alarms set-global ;
+
+: alarm-receive-loop ( -- )
+    receive dup alarm? [ handle-alarm ] [ drop ] if
+    alarm-receive-loop ;
+
+: start-alarm-receiver ( -- )
+    [
+        alarm-receive-loop
+    ] spawn alarm-receiver set-global ;
+
+: alarm-loop ( -- )
+    alarms get-global empty? [
+        do-alarms
+    ] unless 100 sleep alarm-loop ;
+
+: start-alarm-looper ( -- )
+    [
+        alarm-loop
+    ] spawn alarm-looper set-global ;
+
+: send-alarm ( str alarm -- )
+    over set-delegate
+    alarm-receiver get-global send ;
+
+: start-alarm-daemon ( -- )
+    alarms get-global [ V{ } clone alarms set-global ] unless
+    start-alarm-looper
+    start-alarm-receiver ;
+
+[ start-alarm-daemon ] "alarms" add-init-hook
+PRIVATE>
+
+: register-alarm ( alarm -- )
+    "register" send-alarm ;
+
+: unregister-alarm ( alarm -- )
+    "unregister" send-alarm ;
+
+: change-alarm ( alarm-old alarm-new -- )
+    "register" send-alarm
+    "unregister" send-alarm ;
+
+! Example:
+! 5 seconds from-now [ "hi" print flush ] <alarm> register-alarm
diff --git a/extra/concurrency/concurrency.factor b/extra/concurrency/concurrency.factor
index 426ef617ca..1e9b769823 100644
--- a/extra/concurrency/concurrency.factor
+++ b/extra/concurrency/concurrency.factor
@@ -43,7 +43,6 @@ TUPLE: thread timeout continuation continued? ;
 : (mailbox-block-if-empty) ( mailbox timeout -- mailbox2 )
     over mailbox-empty? [
         [ <thread> swap mailbox-threads push stop ] callcc0
-        "(mailbox-block-if-empty)" print flush
         (mailbox-block-if-empty)
     ] [
         drop
diff --git a/misc/install.sh b/misc/install.sh
index baf05192ec..006a7cf604 100755
--- a/misc/install.sh
+++ b/misc/install.sh
@@ -112,7 +112,7 @@ check_ret wget
 if [[ $OS == windows-nt ]] ; then
 	wget http://factorcode.org/dlls/freetype6.dll
 	check_ret
-	wget http://factorcode.org/dlls/zlib1.dla
+	wget http://factorcode.org/dlls/zlib1.dll
 	check_ret
 fi