New update1 build 640

[Build Announcer Script]

http://xs-dev.laptop.org/~cscott/olpc/streams/update1/build640/

-kernel.i586 0:2.6.22-20071120.5.olpc.53add009d83c69b
+kernel.i586 0:2.6.22-20071121.7.olpc.af3dd731d18bc39
-libertas-usb8388-firmware.noarch 2:5.110.20.p2-1.olpc2
+libertas-usb8388-firmware.noarch 2:5.110.20.p4-1.olpc2
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