Killer Methods to find the right key words for e-commerce categories anyone?

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Hello SEOs,

I work for an e-commerce site and we often open new categories Babycare, Arts & Crafts, DIY...

Does anyone have any killer methods to find the right key words for sub categories, items,...

Handy tools? Tips?  Google doc spread sheet cheat?

Cheers!!!

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[DavidKonigsberg]

Hard work and some tools below

google instant

google keyword tool

insights for search

wordstream

your analytics

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Thanks for the answer David. I already use most of these tools I thought that there might be a hidden gem somewhere that I hadn’t found yet ; )