i've installed the latest build and the issue with mod_rewrite still remain. specifically, i continue to get this message: "I can't tell whether mod_rewrite is running. You may need to configure a rewriting rule yourself."
Does your host run PHP as cgi? If so, you won't have the apache2handler functions to return the available modules, so the installer tells the truth, if not the full story. Complete the install anyway, and check your .htaccess file - the rewrite rules should still get written and Silverstripe should be fine.
I've since read the 2.2.2 rc2 resolves the rewrite so I have successfully installed that now. I still got the "cannot determine if mod_rewrite is working" error but managed to install regardless. My host runs Apache on Linux (of course) so PHP runs normally rather than as cgi.
Most things are working okay in 2.2.2 but there are a few quirks (bugs) which I will look to document.