Are there any tools available that can indicate the search volume for a given set of phrases/keywords for a given location? For example, if I had a local pizza website that served only Manhattan and received 100 hits a day, how could I tell if this is roughly the expected throughput based on audience size or if my number are bad and I need to invest more on keyword analysis, etc.?
Google has a traffic estimator associated with AdWords. Given that it's associated with AdWords, it might be stretching things a bit to assume you'd have the same results with organic search. And it's Google, not search in general.
Still, that's better than nothing.
It seems like Google used to have a different tool for this, but I couldn't find it in a quick search.