Dell :: Current 25% Studio XPS Discount: Rare Or Not?

I know that Dell is known for always/usually having a lot of great coupon codes, but 25% does seem outstanding.

So for those of you who keep a closer eye on Dell than I do - is this degree of discount normal or unusual for Dell? In fact, is there any time of year that tends to be the "best" to get a Dell?

I'm probably not going to take advantage of this discount, but I'm still curious for future purposes. I'm trying to hold out on getting a new machine as long as possible - ideally, until Windows 7 comes preinstalled and perhaps until the new Intel chips/platforms come out...