Microsoft has issued a reminder that in two weeks users will start to see notifications in the taskbar once per day with further notices presented through the Notification Wizard. Then on March 1st the release candidate will start taking automatic reboots every two hours. Officially the RC license expires on June 1, 2010, by which time you will be treated with some "non-genuine" prompts and refused of your wallpaper among other things.
If you haven't moved to the final code yet, you should start planning the migration soon and skip the trouble. Unfortunately there aren't as many Windows 7 deals around anymore and Family Packs seem to have gone the way of the dodo.
Where we can help you is to decide what version is right for you and explain what's the deal between 32-bit and 64-bit installs, among other things.