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I don't think it is going to help your career much, so I would only recommend to do it if you enjoy the classes.
I have never seen a job asking for two Masters. If any employer would be impressed by two Masters, it would be because they are in different disciplines. (e.g., a Masters in CS and a Masters in Finance might look good if you are trying to get a particular position at a financial company)
Two CS Masters is redundant. The only time I have seen this is when a PhD program gives a MS en route to a PhD and the student already had a MS.
Industry is going to value experience over multiple Masters
If you do just enjoy the classes, you might think about a different field that still interests you and is relevant to your day job (e.g., HCI or math).
Or you may just want to look into a PhD program :)
EDIT: According to the responses to this very similar qeustion, Can a masters student apply for a second masters in the same field at another university?, it appears that a lot of schools may not even accept a Masters student that already has a Masters in the same field.