Quoted from DngrWillRobinson:
I have wifi in the house with AT&T and I have a dead spot or two and was told to get a wifi extender. Do you have a recommendation for a really good one?
Sorry to hi-jack the thread.
Few of those work really well, unfortunately. They kind of half-ass the setup, and you end up with 2 separate wifi networks, instead of a single extended one, and it's a pain because all your devices need to be joined separately, and if you're in the point in the house where both are strong, your device will swap between the two, making it unusable. Linksys and Cisco products are PARTICULARLY bad at this. Linksys used to be great, but Cisco bought them and turned them into just a terrible company.
Anyway, I do suggest you upgrade to one of these batwing gyrocopter looking routers I linked to above. They have REALLY good range, and can go through thicker walls. Our house is 100 years old and has an issue with dead spots, even though it's not that large. That router I linked to above completely eliminated the dead spots. (the cheaper one)
If you really really want to get a network you can extend, start by buying a couple Apple AirPort Express and an AirPort Extreme. Apple does the extended-network thing correctly, and you can get a fairly good setup. The good thing about doing this is you can keep adding AirPort Express and joining them,, and eliminate dead spots if you just keep adding them. You do not need to have any other Apple products at all, they work with PCs, laptops, Android phones, Google TV, etc. The bad thing is it's incredibly expensive.
EDIT: the google Wifi solution sounds like it is similar and may be less expensive than the Apple Express route, but I don't have any personal experience with it. In my experience, Apple products are much easier to set up if you're not familiar with the intimate details of how this all works, but it's not like Google stuff is bad or anything,