Nope, didn't buy any second subscriptions. Earlier this year, I had double subscription-itis (edit: I don't remember the details now, but I think I got a "subscription expiring" email, so I "renewed" and added another subscription). I canceled both, waited until I was no longer showing as a community supporter, and signed up again. It's been fine since then, and I haven't made any changes since then (that was April, according to Paypal).
When I look under Paid Subscriptions in my profile, it says I have one active subscription. It says it started October 2009 & expires February 2011; I'm assuming the two payments covered this month and January.
Paypal shows the two cancelled subscriptions, and only one active one. So I don't think I'm double subscribed.