Grab TradeSkillInfo and TradeSkillInfoUI from
http://files.wowace.com/ - it will provide you with a database of all skills for all professions, and keep track of which ones your alts already know.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh