From their return policy page:

Some manufacturers have implemented returns restrictions that prevent CircuitCity.com from being able to accept returns or offer exchanges, replacements or credits on their products for any reason. Please check the item listing on our website to determine if special return policies are applicable to your products. Support as well as exchanges or replacements for products with manufacturer or supplier restrictions, including within the first 30 days of ownership, must be handled directly with the product manufacturer or supplier. You can find the manufacturer or suppliers contact information in your product manual, in the item listing, on the manufacturer's website or at our help center .

Apparently, select products from major manufacturers like Compaq, IBM, Hewlett Packard, Toshiba, Epson, Nintendo, Kodak and others fall into this list—but, as they noted, Circuit City does lay out the return policy for each item on its respective product page. I don't think it's something that should drive you away from CircuitCity.com altogether—but it is something that you should pay attention to should you ever make a purchase there. [Crunchgear]

Other policies include:

•The Market will allow unlimited reinstalls of purchased apps.
•Upgrades must come directly from the developer.
•Sexually explicit material is banned from the Android Market.
•Billing disputes must be held with the developer or your credit card company.

Much of that information was to be expected, but an app return policy is a really big deal. I can't tell you how much I would love to shove Sim City on the iPhone back in EA's face right now. It's been out for months and they still haven't fixed a bug that causes it to crash on launch for some users. I can only hope that Apple will eventually follow Google's lead on this one. [Android via IntoMobile]

Starting this week in California, and in April for the rest of the US, Costco will roll out their new electronics return policy. Now we'll only have 90 days to abuse use their no questions asked mentality. After that it will turn into a regular 2 year warranty.

But don't get your panties into too big of a twist yet, there's still no word on previous purchases. So maybe, just maybe that 50" plasma you bought last year will still be covered by their old plan.– Ben Longo

Costco tightens return policy on electronics [MSNBC]

That's because when dealing with new releases Apple has two different policies.

Policy 1: Standard Apple return policy. 14 days from date of purchase + a 10% restocking fee.
Earliest Safety Date: December 26th

Policy 2: If Apple releases a new model of your machine thereby reducing the price of your model or just drops the price. You have 10 days from date of purchase to get the new price with $0 in fees.
Earliest Safety Date: December 30th

So if you have to have it now, try and wait a little longer. That way in January when the Keynote comes around, you won't be quite as scornful towards your old Macbook Pro that you bought in December.– Benjamin Longo