Latest Chrome Frame 15 user agents:

User Agent PlatformDevice
Mozilla/4.0(compatible;MSIE8.0;WindowsNT5.1;Trident/4.0;chromeframe/15.0.874.121;.NETCLR1.0.3705;.NETCLR1.1.4322;.NETCLR2.0.50727;.NETCLR3.0.4506.2152;.NETCLR3.5.30729;.NET4.0C;.NET4.0E;InfoPath.2) WindowsUnknown
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; chromeframe/15.0.874.121; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3; MS-RTC LM 8) Windows 7Unknown
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; chromeframe/15.0.874.106; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0) Windows 7Unknown