add link to Facebook group

[web/altusmetrum] / index.mdwn

diff --git a/index.mdwn b/index.mdwn
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--- a/index.mdwn
+++ b/index.mdwn
@@ -19,11 +19,14 @@ or compatible licenses.
 # Hobby Rocketry #
 
 The motivation for the circuits and software you will find on this site is
-our loosely-knit group's shared interest in hobby rocketry.  Rather than 
-try to introduce the hobby to you here, we note that John Coker 
+our loosely-knit group's shared interest in hobby rocketry.  This very brief
+[Ted presentation by Steve Jurvetson](http://www.ted.com/talks/steve_jurvetson_on_model_rocketry.html)
+quickly conveys at least part of why we do this.  John Coker 
 has published an excellent 
 [overview of hobby rocketry](http://www.jcrocket.com/welcome.shtml) 
-on his web site.  
+on his web site.  Keith has also put together some useful notes about the 
+process of [certification](http://keithp.com/rockets/certification/) to
+fly high power rockets.
 <p>
 To find more information about the rockets Bdale and his son have built, see
 [Garbee Rockets](http://www.gag.com/rockets).
@@ -37,25 +40,35 @@ various friends!
 
 # Projects #
 
-* [AltusMetrum](AltusMetrum/)
-was Bdale's original project here, a dual-deploy rocketry altimeter.  One 
-prototype was built, but never flown.  This project is now indefinitely on hold.
-
 * [TeleMetrum](TeleMetrum/) 
-is our current project, a dual-deploy rocketry altimeter with improved sensor 
+is our primary project, a dual-deploy rocketry altimeter with improved sensor 
 complement and bidirectional RF telemetry link.
 
-* [TelePyro](TelePyro/) is an 8-channel pyro expansion board for 
+* [TeleDongle](TeleDongle/) 
+is a simple RF interface for use in ground stations interacting with rockets
+using [TeleMetrum](TeleMetrum/).  It may also be useful as a generic RF
+interface for other microcontroller systems.
+
+* [AltOS](AltOS/) 
+is the name of the firmware and related utilities that Keith maintains for
+the set of hardware projects here.
+
+* [TelePyro](TelePyro/) is a planned 8-channel pyro expansion board for 
 [TeleMetrum](TeleMetrum/).
 
-* [TeleTerra](TeleTerra) is a hand-held ground station for use with 
+* [TeleTerra](TeleTerra) is a  planned hand-held ground station for use with 
 [TeleMetrum](TeleMetrum/).
 
+* [AltusMetrum](AltusMetrum/)
+was Bdale's original project here, a dual-deploy rocketry altimeter.  One 
+prototype was built, but never flown.  This project is now indefinitely on hold.
+
 # Participants #
 
 * [Bdale Garbee](http://gag.com/~bdale)
 * [Keith Packard](http://keithp.com/keithp)
-* [Carl Worth](http://cworth.org)
+
+# [Presentations](talks) #
 
 # Getting Involved #
 
@@ -65,8 +78,18 @@ start.  Finding a local [NAR Section](http://nar.org/NARsect.html) or
 learn a lot and see some great flights by showing up at a club launch.
 
 As we make progress, you can read about it in our [News](News) feed.
-We also have an IRC channel #altusmetrum on irc.oftc.net if you have
-questions that aren't answered here.
+We also hang out on IRC channel #altusmetrum on irc.oftc.net if you have
+questions that aren't answered here.  And if you're a Facebook user, you
+can join the [Altus Metrum](http://www.facebook.com/group.php?gid=341167482968)
+Facebook group.
+
+Our main projects include radio links.  If you don't already have one, 
+getting an [Amateur Radio](./Radio) license would be a good thing to do!
+
+And if you just can't wait to show your support for our efforts, visit
+our [Cafe Press Logo Shop](http://cafepress.com/altusmetrum) or our
+[Printfection Logo Shop](http://printfection.com/altusmetrum) (we're trying
+to decide which is better, comments welcome!) and buy a t-shirt or sticker!
 
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