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Rule of thumb is if its a niche directory specific for your industry  then go for it otherwise unless it dmoz or really strong and popular dont. All the link and seo directories i would stay away from.

Woot! Way to go!

Hi everyone, Just a quick note to let you know the keyword difficulty tool is working again. Thanks for your patience! Keri

I love it when my competitors use the keyword tag! Not sure why you want to use it even if the smaller engines use it, as the downside must outway any benefits!