Forgive me for being kindof ignorant here, but wouldn't this be pretty heavily dependent on your connection? If you're close (logically, as in network hops) to their datacenter?

Here: http://www.linode.com/avail/

That's a list of their systems. If you want to test the latency, ping one of them. For instance I'm on qwest's network in Phoenix, AZ. My ping time to

dallas1.linode.com is 40-45ms.

atlanta1.linode.com is 85-100

They're named by city...dallas1.linode.com fremont1.linode.com atlanta1.linode.com etc. etc.