Lots of companies make esata external docks -- Thermaltake and tons of lesser brands.
For an even better connection I just switched over to a Icy Dock (MB971SP-B) $42 from Newegg. It takes up a optical slot in your computer (5.25 inch) and has two docks, one 2.5 and one 3.5 that both attach directly to an internal SATA port so you get full speed transfers. If you go that way, download the freeware app HotSwap! 6.0 as it does a very good job of unmounting and remounting volumes (better than Win 7).