I never get it anymore since I don't tend to own any laptop over a year or year and a half. I will likely upgrade at that time and when I sell it, I hardly EVER see laptops that have warranties sell for much more than those without. Also, I used to get it and ended up never using it, so for me...it's not worth the $200-300 extra. And also, most laptop problems are either accidental damages (drops, spills, etc...) which many warranties to not cover or are hard drive related, which is easy and cheap to replace.
Just think of it this way....Dell, HP, IBM, and other hardware manufacturers and retailers make LOTS of money on Warranties because there is a HUGE mark-up. It's all actuarial in that they calculate profits and losses, and profits heavily outweigh losses. For every 10 extended warranties that they sell, they know that there will likely be only 5 or 6 claims, of which 1 or 2 will not be covered and the 1 or 2 will probably be MUCH cheaper than what the extended warranty costs to fix. This leaves 1 or 2 claims out of 10 that they will actually LOSE money on. These figures are simplified and may be slightly exaggerated, but I'm guessing that I'm not off by far.
Now if you're the type that has bad luck with electronics (usually means that you're rough on things and tend to break things a lot), then it may be worth it for you since you may be one or two out of 10 people that may actually benefit/profit/break even with an extended warranty.
Also, keep in mind the opportunity cost of that $300 or whatever that costs for the extended warranty. Think in terms of insurance companies, since a warranty is essentially an "insurance" and this is how insurance companies think. You can put the $300 in a conservative fund that gives you 8% growth. That's another $75 or so in the span of 3 years, so it's actually costing you about $375 in the span or 3 years...possibly more. That $375 could probably easily cover any type of damage you may incure or go towards the purchase of an new laptop.
Oh, and I recently purchased a new Toyota Prius for my wife and got the extended warranty so I'm not totally against the idea of extended warranties...especially if it's on a "newer" technology and the long-term prospects are yet to be defined.