How can you figure out when your expiration date is for your current plan/membership? I assumed it was in the control panel somewhere but I don't see it...
It may not be the only way but I check it by clicking on the (Upgrade your membership!) link in the user information that's in the upper left corner. It will tell you your current level and when it is due to upgrade.
Not only that, but you will get a big red reminder in your user info box starting a couple (?) weeks before your membership is up. You won't be able to miss it.