Download Windows 7 ISO (x86 / x64) from Official Website

[UPDATE: August 8th 2011]
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                After nearly a year of the release of Windows 7 Service Pack 1, you can now download new Windows 7 ISO images that comes with the Service Pack 1 (SP1) pre-installed. That means you don’t need to download all the windows updates for a fresh new install, this will save you many hours after your fresh install of Windows 7. It is strongly recommended to download the new ISO that comes with Service Pack 1 pre-installed if you need to install any Windows 7. As usual, the list below are all from official Microsoft retailer download links ..
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• Windows 7 Home Premium Service Pack 1 x86 ISO 32-bit

http://msft.digitalrivercontent.net/win/X17-58996.iso

• Windows 7 Home Premium Service Pack 1 x64 ISO 64-bit

http://msft.digitalrivercontent.net/win/X17-58997.iso

• Windows 7 Professional Service Pack 1 x86 ISO 32-bit

http://msft.digitalrivercontent.net/win/X17-59183.iso

• Windows 7 Professional Service Pack 1 x64 ISO 64-bit

http://msft.digitalrivercontent.net/win/X17-59186.iso

• Windows 7 Ultimate Service Pack 1 x86 ISO 32-bit

http://msft.digitalrivercontent.net/win/X17-59463.iso

• Windows 7 Ultimate Service Pack 1 x64 ISO 64-bit

http://msft.digitalrivercontent.net/win/X17-59465.iso
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You will not be able to download or install Windows 7 Starter, the only way to obtain is through OEM netbooks.