FWIW, teach yourself to catch-and-throw very quickly... a speedy release of the ball (in the infield, at least) can usually make up for a subpar arm (see David Eckstein, Angels SS).
Also, it may seem weird, but those baseball infomercials (forget the name) with Fred McGriff "endorsing" them have very good throwing mechanics, and ways to teach them.
I think they're the Tom Emanski videos (he's the teacher)
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