Beware of Match.com's subscription. I signed up for just one month at $34.99 and was not informed that I would continue to receive a charge every month if I did not cancel the service. By the time I noticed, I was three months into it.
I think a good rule of thumb for signing up for online services is to use a paypal account, if possible, or a refillable VISA account. Don't even give them the room to debit money from your account.