Just like when the Windows 7 beta was released, there was some heavy downloading for the RC released to Technet and MSDN members yesterday. I'd expect even more of the same on 5th May, so be patient
You can read more here.
Desperate beta testers brought down Microsoft's Windows 7 download page yesterday for about two hours.
Only Microsoft Developer Network members and TechNet members were offered keys, but Microsoft still had to make some changes to keep the site up and running. The MSDN blog said "systems are having trouble keeping up" and thanked people for their patience.
The Release Candidate code will be available to the great unwashed public from 5 May.
You can read more here.