Did you ride your bike in wet conditions after the tune-up? I don't see why it would rust otherwise unless it sat for a long time in humidity.
Lube the chain frequently. I put about 100 miles on my bike weekly, and I generally lube the chain every other ride. Maybe a little excessive, but I feel a big difference in the ride quality of the drive train that way. I personally used Pedro's Ice Wax (I think that's what it is called). It just works nicely for me, there are many other good lubes out there.
Go to your LBS and ask them for their recommendation on a chain lube.
Also, clean your chain whenever your drive chain starts to accumulate gunk, grease, and road grim. Park makes a really good cleaning solution and tool that I would recommend to anyone. Purchasing that would also help in chain maintenance.
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