Arials have been available from
http://terraserver.microsoft.com for some time now. From their homepage:
Quote:
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TerraServer contains 3.3 tera-bytes of high resolution USGS aerial imagery and USGS topographic maps. You can locate imagery by clicking on the map above, entering a city or town name in the "Search TerraServer" form at the top of the page, or entering a U.S. street address. Click on Advanced Find to see other methods for searching our imagery database.
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Only for the US though.