Does anyone know of a way of determining or estimating the number of
page impression a particular website gets each day/week/month/year?

The background: I have been asked by a company to estimate the number
of impressions their website will get when they launch a new service
next year. I am hoping that by analysing the hit rate experiences of
their competitors I will be able to guage the existing market size
from which I can make some market share assumptions.

The obvious answer is "ask the webmaster". Alas this is not an option.
The competition will not tell me anything.

Even if you just an idea for guessing the hit rate, that would be a help.

Thanks.

dghn

You could use the site's Alexa ranking to estimate the number of hits:

http://www.marketing-strategy.info/alexachart.html 

More on Alexa, in case you aren't already using their services:

http://pages.alexa.com/prod_serv/data_services.html

Depending on the cliets populatity it could be about 1000 a day