Give it a try here: http://www.pingtest.net
This is especially useful for people in Thailand trying to stream data or play multi-player games on servers overseas. Try testing your latency to Bangkok, then to a foreign destination. The traffic bottlenecks at the undersea data cables after being squeezed through government filters and ISP proxies, which explains the pitiful latency. It’s not quite as bad as DSL being beat by carrier pigeon, but it does explain why Skype and internet radio reception can be so crappy a lot of the time.