The Merge Vertices Tool, will allow you to select and merge multiple vertices at one time. Be careful, if the setting is not right when you click it, then you may have quite a few un wanted merges.
Chris (formerly R@nSiD)
Twitter
When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)