Since Microsoft has announced the project, the site has been absolutely overwhelmed. They've put up tons more servers and tons more people have hit it. But once the initial newness wears off, it will be a wonderful resource. So far, I haven't had any complete images return. The downloads have all died before they completed.
Specs are pretty impressive.
Initial speed is 400 MHz, which should go up rapidly. The L2 cache has been increased from 512K to 1 or 2 megs, depending on configuration. This is where you sign up. It's free, but you'll get their generally worthless newsletter as a result of signing up, so think about how badly you want to know. And ZD Net has an excellent discussion of the tools that are included in the Win98 disk, but are not installed by default.