We haven't, but we're considering it. The trouble is that the transaction costs involved are pretty nasty. You can negotiate with your realtor to take less than a 3% commission, but you still have to pay the other realtor 3% and pay taxes. I have a friend who just sold two houses and she said that in this market people also want you to pay the closing costs. Her estimate was that the transaction costs ate up close to 10% of the selling price of the house which is an awful lot.
Since it is costly to change houses we're taking it slowly and figuring out where we want to live and how we want to do things. The house is paid for so the main concerns are that (1) taxes are high and (2) it's tying up a lot of money so that we can't invest it and live off the income. We have kids and I think we will want a house with a yard... but we could get a smaller house. Here is what we are considering:
1) Renting from my parents whose house is kind of two units (2 kitchens etc. but no separate entrance). The rental income would help them retire, it would save us money, and it would be nice to see more of them. It's also in a more central location so that buses etc. would be easier.
2) Buying a smaller house
3) Moving to a small house in an entirely different area. (very low probability)
4) Staying where we are for a few years and hoping our local real estate market will perk up a bit. The nearby city is doing well, but it's still pretty bad out in the country and there are too many houses on the market in our neighborhood.
5) Staying where we are permanently and just saving up more to keep up with the property taxes.
That doesn't really answer your question, but we've been thinking about the same thing and that's what we have been considering.
I think you did well to keep the house down to twice your income, honestly, as most people spend about 40% of their income on housing. Maybe you get some roommates to reduce your housing costs? Or rent it out entirely and live in an apartment?