Ratbastid is right.
I've introduced two new cats to my house in the last 3-4 years. My orginal cat, a siamese, was pissed about them at first. Later she started ignoring them. Now, they walk around the house together like they're one animal made out of the bodies of three cats.
One big thing to watch out for is urinating. Even if your cats are fixed they _might_ piss around the house. I suppose it's a territorial thing, but it's certainly annoying and a real pain to clean. For that reason I advise keeping them somewhat confined when you're not home for the first couple of weeks. Once they warm up to each other the pissing shouldn't be a problem.
I'm no expert, but that's my experience.
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I'm not sarcastic. I mean it.
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