If you are a TechNet or MSDN subscriber then you can download Windows 7 Service Pack 1 or Window Server 2008 R2 Service Pack 1 today.
Below is an image of what is available
If you are a not a TechNet or MSDN subscriber, you have to wait until February 22nd to download yours.
If you have been patching your Windows 7 machine then you already have most of what is in the service pack, the service pack is just a rollup of all the patches that have been issued since Windows 7 was released. It is still handy if you have a new machine since you don’t need to then download all the patches