One of the current items under investigation for Nomitor is an appropriate CDN. Obviously as a startup we're not going to be doing massive traffic from day one so finding a suitable CDN partner who will let us start small and scale with us over the long term is a tricky task.
As evidenced by cdnlist.com there is a very large list of CDNs out there. Besides the obvious price considerations the other key criteria is geographical distribution. Evaluating that is a little tricky but with some coding we're using various open recursive resolvers to get a rough picture of a CDN's network.
So when I heard of Cotendo today I thought I'd give it a whirl. Their site says they have locations throughout the US and Europe, and from the list of IPs I was able to gather for www.cotendo.com, I'd say I agree. :)
7.137.93.208.in-addr.arpa => LB01.SANJ.COTENDO.NET. 7.139.93.208.in-addr.arpa => LB01.CHIC.COTENDO.NET. 7.140.93.208.in-addr.arpa => LB01.ASHB.COTENDO.NET. 7.141.93.208.in-addr.arpa => LB01.LSAG.COTENDO.NET. 7.142.93.208.in-addr.arpa => LB01.DALL.COTENDO.NET. 7.143.93.208.in-addr.arpa => LB01.NYNY.COTENDO.NET. 7.72.127.94.in-addr.arpa => LB01.AMST.COTENDO.NET. 7.74.127.94.in-addr.arpa => LB01.LOND.COTENDO.NET.
Not all the CDNs setup their PTRs so nicely. Big ups to Cotendo for having well maintained DNS.