I have Samsung Q310 laptop with Intel Wireless Wi-Fi Link 5100 Card.
I would like to confirm that the injection test is working OK with kernel linux-2.6.27-rc7.tar.bz2,
patchet with the latest iwlwifi drivers patch, wich enables packet injection for iwlagn.
In order to get injection working on Intel 5100 card download the latest linux-2.6.27-rc7.tar.bz2 kernel and patch the iwlwifi driver with the diffs from the latest kernel iwlwifi driver changes from Stefanik Gábor here
I hope the iwlwifi driver changes will bi included in the next 2.6.27 kernel version.