Hi,
In theory, Google will not index pages that use a URL token to maintain
session information. In the case of ColdFusion, this is the CFID and CFTOKEN in
the URL. Having said that, if you search for:
site:greenpeace.org.uk
in Google, you can see that it is indexing pages with these tokens.
To be on the safe side (in case they fix that some day) as long as you don't
use these tokens you will be indexed by Google, regardless of whether you are
using session variables (there isn't really any way of Google knowing).
Having said that, Google indexes pages with .html far faster than .cfm. We
launched a new web site with many thousands of pages recently. We started off
with .cfm file names and google added pages to it's index at a rate of about
100 per day. When we changed to file names ending in .html, this increased to
about 2000 per day.
Ian