I stumbled upon this product while looking through the eco-friendly items on Etsy.com. Handknitted 4 You has been on Etsy for a bit over a year now. They make adorable hand knit items of all sorts. The hand knit Swiffer pads are available as singles or in sets of three. I got a single one for $3.50 plus shipping.
Pros: It works great! It picks up hair and cat fur and all the other junk that lives on my floor. It is machine washable. It did shrink a wee bit the first wash, but not enough to make it fit any worse.
Cons: I would say that the only downfall that I've found is that you can only use the pad once before having to wash it. You might be able to flip it inside out and use it a second time, but I've tried and it's been pretty hard to flip like that.
Overall, it's great! I plan to buy some more when I run out of the disposable pads that I still have.