At my job we are currently starting up a new ecomm project and I am really curious what taxation software you guys normal use. We need to be able to look up various tax rates for products and services by zip code.<p>We are a rails shop and I would love to find something like braintree for taxation but that doesn't appear to be out there. We have looked at billsoft and vertex, but they don't seem to promote a nice api.<p>Strikeiron and taxcloud appear to be options, but I question how scalable they are. Has anyone used them?<p>Finally, thanks in advance for your great advice.