Which is correct, "Product A is released" or "Product A has been released"?

I believe I've noticed RinkWorks using both, with the "is released" construction being used most recently (could be completely wrong about this, though.)

Personally, the "is released" construction always strikes me as wrong, but I can't say precisely why. Partly I think it's because "released" is past tense, but "is" implies present tense. So "is released" seems to be mixing tenses. It also seems to make it sound like the "release" is something that is ongoing and continuous, when to my way of thinking, you release something once, and you talk about it in the past tense afterwards--thus, "has been released".

Anyway, I dunno. I think about crazy things.

-- Dave