This is an incredibly ancient thread.
You can snort anything that can be crushed into a powder, or is otherwise small enough to fit up the nose. I thought this much was obvious. Is it going to be better or more efficient than simply swallowing the drug? That's the question that needs asking.
Having snorted Xanax, Valium, Clonazepam, etc. personally speaking, the answer is no. Snorting Xanax delays onset (not taking into account placebo), and I got more out of my dose simply swallowing it. There's no point to it. Likewise for all the other benzos. The only thing that I found beneficial in terms of increasing the onset of action was disolving the pill in small amounts of ethanol, and swallowing that instead.
The only benzo that can and should be snorted is Midazolam, as far as I'm concerned.