Sitemeer just underwent a major overhaul and got a long-requested feature added: Multi-Location Checks
Up until now Sitemeer sent its test requests from only one location. Now it will do so from a number of geographically diverse locations. The feature is not fully live yet but can be previewed at http://beta.sitemeer.com
Please do share your impressions and please keep in mind it's still in beta, so a thing or two might be quirky.