Or just buy some of the well-made reusable ones available on Ebay. There's also recipes online for refilling the cleaning solution.

@mopar_man: Here's one for the cleaning solution refill.

a piece of polarfleece-type fabric cut to size also works very well as a washable refill.

I have reusable microfiber cloths from Method (about $5 apiece) and affix them to the swiffer in the traditional manner. They can usually do a few rooms' worth of wood floors, when they're dirty I throw them in the laundry pile.
Method makes their own swiffer-style duster now. I bought one, and the mop head is great for wet cleaning, but I don't like their dusting cloths and the head of the thing is too large to use their microfiber cloths. Jerks.

@kerry:

Method also makes a wood-floor duster/wet clean thingie. It comes with microfiber cloths and a fabric cleaning thing, plus a bottle of cleaning liquid.

I heart Method. Target is going to start carrying their new shower gels, soaps and deodorants starting this month.

@Dustbunny: Ooh! Deodorant! I have the Method sweeper (hate the name, "omop") with the microfiber mop head, and it does a good job with wet cleaning. I might buy a couple more to use for dry dusting. I just hate buying disposable stuff, so even though their duster cloths are compostable I still feel like it's a waste.

or you can just buy a mop

For microfiber cloths, pass up the ones in the cleaning aisle and head back to automotive. They often have them in multipacks for much less.

Or you can just get durable paper-towels. They work just as well.

Yeah. If you are having to hand wash and reuse swiffer pads, then it may be a good idea to just get yourself an actual mop and just hand wash (and microwave while still moist) the sponge heads.