Not working examples :

useraxis@useraxis.org [~/test]# git clone http://github.com/tablatom/hobo.git
Initialized empty Git repository in /home/useraxis/test/hobo/.git/
Getting alternates list for http://github.com/tablatom/hobo.git
Getting pack list for http://github.com/tablatom/hobo.git
error: The requested URL returned error: 500
error: Unable to find d31a71cf5d5fa8331977bc9479abc807defb510e under http://github.com/tablatom/hobo.git
Cannot obtain needed object d31a71cf5d5fa8331977bc9479abc807defb510e

useraxis@useraxis.org [~/test]# git clone http://github.com/technoweenie/mephisto.git
Initialized empty Git repository in /home/useraxis/test/mephisto/.git/
Getting alternates list for http://github.com/technoweenie/mephisto.git
Also look at http://github.com/halorgium/mephisto.git/
Getting pack list for http://github.com/technoweenie/mephisto.git
error: The requested URL returned error: 500
Getting pack list for http://github.com/halorgium/mephisto.git/
error: The requested URL returned error: 500
error: Unable to find e9fc1471b8f368184b9197dd1d37599a4efa4c22 under http://github.com/technoweenie/mephisto.git
Cannot obtain needed object e9fc1471b8f368184b9197dd1d37599a4efa4c22

working example :

useraxis@useraxis.org [~/test]# git clone http://github.com/defunkt/facebox.git
Initialized empty Git repository in /home/useraxis/test/facebox/.git/
Getting alternates list for http://github.com/defunkt/facebox.git
Getting pack list for http://github.com/defunkt/facebox.git
Getting index for pack 0b53d18dc6f8d741a8cf51295ddeead6dd268771
Getting pack 0b53d18dc6f8d741a8cf51295ddeead6dd268771
 which contains 4bf7a39e8c4ec54f8b4cd594a3616d69004aba69
walk 4bf7a39e8c4ec54f8b4cd594a3616d69004aba69
walk cd13d9a61288dceb0a7aa73b55ed2fd019f4f1f7
walk 3211367cab73233af66dac2710c94682f3f3b9b2
walk 7dd94ee84787a2887f929226408109bf78a0fba3
walk 9b8c6e544533e17ffdf2c2f8f45936b18a852e0a
walk f77e00b10fcb6e09eb93110ffe09a10e23211141
walk d7b67e7fc1a8a9de0e28e6824c08b3b52719708d
walk fce84b4fccc622fa682b8550785cd596a0539c33
walk ec72c3df2f7c534f9e913b37f767a2a650647b0f
walk fc18e486123da27cbf82dbb4b6d1ce462f301655
walk 409e6514dff5a2ef6500f3438403f9ed35d3d9cd
walk 4cd991b001670bce2ffaf45957f69c1086c21e40
walk 554c03c2e432340293afd56d56cb26a80f3e336b
walk 16c6542a0475179215a1667cd505960f1913dc3d
walk 785535c58657425174639774fa5ed9f90b468ae8
walk e4e7aac29434bf8e038b3e2a9fa3ceb9d9465609
walk 38153e7032f080850de3ad0ee5cbeecbfa8b85bf
walk e55ccdbcefe5c897946805c77dcfefe212f19d14
walk f4eee0a18e2c2f147b5d96c89969eef43ebc69a8
walk 42c23f435ee021ee30af912b112bc90980f661e7
walk a4c12b95e7f5d6573d660725bef5707100d07078
walk 37eec54a012928ad5bf37b9d49e1b0ba9b026720
walk 2525b57620f58af55465ef049a189d021924c232
walk bf64466664441adcfdf8ef58ac525c418c93659c
walk 98e0927d71a31ea2eb53cc505f8cfe639ff5d230
walk e23fd12ac42082027256b9e1970ce870c2719e24
walk 2b862cbcbe8c8ead1549215240cb53ce272f73f9
walk d4f1c62e26be612f81508c8e0166c1e6b025879e
walk 75822fc6473f2375d73a7ea5df7bcef6b7de03ca
useraxis@useraxis.org [~/test]# ls -l facebox
total 261
drwxr-xr-x  5 useraxis useraxis    720 Jun 20 14:57 ./
drwxr-xr-x  5 useraxis useraxis    128 Jun 20 14:57 ../
drwxr-xr-x  8 useraxis useraxis    296 Jun 20 14:57 .git/
-rw-r--r--  1 useraxis useraxis     10 Jun 20 14:57 .gitignore
-rw-r--r--  1 useraxis useraxis    178 Jun 20 14:57 README.txt
-rw-r--r--  1 useraxis useraxis     84 Jun 20 14:57 b.png
-rw-r--r--  1 useraxis useraxis    124 Jun 20 14:57 bl.png
-rw-r--r--  1 useraxis useraxis    124 Jun 20 14:57 br.png
-rwxr-xr-x  1 useraxis useraxis    313 Jun 20 14:57 build_tar.sh*
-rwxr-xr-x  1 useraxis useraxis    979 Jun 20 14:57 closelabel.gif*
-rw-r--r--  1 useraxis useraxis   1349 Jun 20 14:57 facebox.css
-rw-r--r--  1 useraxis useraxis   9478 Jun 20 14:57 facebox.js
-rw-r--r--  1 useraxis useraxis   1681 Jun 20 14:57 faceplant.css
-rw-r--r--  1 useraxis useraxis   8576 Jun 20 14:57 index.html
-rw-r--r--  1 useraxis useraxis  46438 Jun 20 14:57 jquery.js
-rwxr-xr-x  1 useraxis useraxis   2767 Jun 20 14:57 loading.gif*
-rw-r--r--  1 useraxis useraxis   3841 Jun 20 14:57 logo.png
drwxr-xr-x  2 useraxis useraxis     80 Jun 20 14:57 releases/
-rw-r--r--  1 useraxis useraxis     52 Jun 20 14:57 remote.html
drwxr-xr-x  2 useraxis useraxis    352 Jun 20 14:57 screenshots/
-rw-r--r--  1 useraxis useraxis     49 Jun 20 14:57 shadow.gif
-rw-r--r--  1 useraxis useraxis 123145 Jun 20 14:57 stairs.jpg
-rw-r--r--  1 useraxis useraxis   1369 Jun 20 14:57 test.html
-rw-r--r--  1 useraxis useraxis    132 Jun 20 14:57 tl.png
-rw-r--r--  1 useraxis useraxis    125 Jun 20 14:57 tr.png
useraxis@useraxis.org [~/test]#