In software development terms, Release Candidate is the final stretch. The first Service Pack for Windows 7 is pretty much all the updates released so far collected in a single package, plus improvements to virtualization and remote desktop use…
Service Pack 1 will bring Windows 7 computers up to date if their auto-update was off all this time (some companies do that in their offices, in case some update turns out to be faulty). The two new things that SP1 brings are RemoteFX and Dynamic Memory.
Dynamic Memory will improve memory usage if you use Hyper-V virtualization. RemoteFX is slightly more interesting – it’s imbues remote desktop connections with support for Aero, full motion video and playing 3D games. You can read more about it here.
Anyway, the more impatient among you can get the Windows 7 Service Pack 1 from here (it works for Windows Server 2008 R2 too). The rest will have to wait till Q1 of 2011 when the final version of SP1 comes out.