I just canceled Home Savings Mall online with no problems. I didn't get the initial signup email (probably got lost in my spam filter), so I used the "Forgot ID" link and it was emailed to me about 20 mins later. Canceling Home Savings Mall online also canceled Cross Country Savings. I went to CCS's website to cancel, and when I entered my member ID, it said that I had already canceled. I haven't signed up for the other two easy ones yet, but I'm willing to guess that they are just as easy to cancel.
Also found it weird that my creditreport.com account had already been canceled when I called today (it was the seventh day since I signed up last monday), so I'm guessing it was canceled because my paypal VCC wasn't working for them, since I had shut it down right after I set it up and used it last week. I got the cancellation # from the operator, so I should be good to go. Placed an order for UFC 2009 Undisputed last Friday, glad to finally get another game from the site after taking a few months off.