I just purchased a house, and it has oil heat. The inspector told us that the ducts are in place to easily convert to gas, which I would prefer. What are the costs associated with this, and do I just call the electric and gas company for everything (furnace etc..)?

Yes, consult the gas company first, they often have specials on equipment and rebates. Though it won't save you money, unless you buy a high-efficiency 94%-plus gas furnace, it is a way not to have to be concerned with owning your fuel, just paying the utility monthly and calling the repairman when the sensor needs cleaning each year.

Is there nat service in your home or area? Check it out to make sure.. If you don't you may have to pay to have gas service brought to your home. If no nat gas, then there's LP

Go to fuel comparisons. to see if it's worth switching over to gas in your area.

As stated by others, there are question to ask. When I moved into my house, we had oil. I had it changed to gas. Costs were (approximately as it was a few years ago):

1) Have the gas company run the gas line down the street for me - $5,000. If the gas line were already at the street, it would have been free to run the line to my house.
2) New furnace/AC unit, outside compressor, electrostatic air filters, humidifier, and water heater $8,000 (or so) - all installed.

The house has a gas stove, so does that mean that they do not need to run an additional gas line?

In reply to:

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The house has a gas stove, so does that mean that they do not need to run an additional gas line?

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Assuming it isn't a LP tank feeding the stove, most probably no. I say most probably because I would assume the gas line running to the house is big enough to supply the furnace, stove, and water heater (should you wish to change that too). However, for some reason, the gas line could be too small. But if the inspector didn't mention it (after mentioning the coversion would be easy), it is most likely big enough.

If you call a furance company to get an estimate, they would be able to quickly tell if there is a line size issue.