Download Windows Server 2008 SP1 Standard Edition:
http://download.microsoft.com/download/d/d/b/ddb17dc1-a879-44dd-bd11-c0991d292ad7/6001.18000.080118-1840_x86fre_Server_en-us-KRMSFRE_EN_DVD.iso

Download Windows Server 2008 SP1 Enterprise Edition:
http://download.microsoft.com/download/b/4/d/b4dc75a1-d7d2-4f31-87f9-e02c950e8d31/6001.18000.080118-1840_x86fre_Server_en-us-KRMSFRE_EN_DVD.iso

Download Windows Server 2008 SP1 Web Server Edition:
http://download.microsoft.com/download/1/e/3/1e332e6c-9f8a-47ba-b380-8fdef29e9d57/6001.18000.080118-1840_x86fre_ServerWeb_en-us-KRMWFRE_EN_DVD.iso

Download Windows Server 2008 SP1 Data Center Edition:
http://download.microsoft.com/download/4/d/0/4d0cdf3f-59aa-49f2-b69f-91e33b906150/6001.18000.080118-1840_x86fre_Server_en-us-KRMSFRE_EN_DVD.iso

Download Windows Server 2008 - 64 Bit Versions Standard Edition:
http://download.microsoft.com/download/d/d/b/ddb17dc1-a879-44dd-bd11-c0991d292ad7/6001.18000.080118-1840_amd64fre_Server_en-us-KRMSXFRE_EN_DVD.iso

Download Windows Server 2008 - 64 Bit Versions Enterprise Edition:
http://download.microsoft.com/download/b/4/d/b4dc75a1-d7d2-4f31-87f9-e02c950e8d31/6001.18000.080118-1840_amd64fre_Server_en-us-KRMSXFRE_EN_DVD.iso