Credit cards & limits - Part deux

This weekend I logged in to my online banking website to check out whether my latest credit card payment had been posted to my account, and I noticed something strange: my credit limit had been increased. Now I purposefully have a low credit limit to discourage myself from spending it, as I know that I would. I even had the bank put a note on my file, telling them not to raise it without asking me first (most banks have this feature, you just have to ask). So I was a little concerned to see the increase, especially because they raised it $3000! They just doubled my limit in the blink of an eye. I was a little stunned. Then yesterday in the mail I got a letter from the head of the Customer Service department telling me about the increase, and how they did it because I'm such a loyal customer, blah, blah, blah.
I'm half tempted to get them to lower the limit again, however they're also giving me a balance transfer deal till May 2007, which would actually allow me to consolidate and cancel another card that I was only using for their low balance transfer rate. I was actually going to have the other card paid off by February anyways, so I wouldn't actually be losing any interest savings anyways. I'd just be saving on the aggravation of having so many cards on my credit history.