How do we report W7 bugs to MS?

I've had a look at MS information and it says that there is no 'feedback' programme for W7 as the RC will 'automatically' report problems back to MS.

Well, I've had a number of quite major issues which I can gaurantee the system won't report back - primarily because the system doesn't even know they've gone wrong! Anyone got any ideas how to actually report these so MS can look at them before rolling out a version to the general public that doesn't actually work some of the time?