Quick Question About Keyword Tactics

I have a quick question about doing PPC in Google Adwords, MSN Adcenter, and Yahoo Search Marketing. I’m familiar with keyword and bidding strategies in Google Adwords. I’m wondering if there should be any difference in the way I do things in Yahoo Search Marketing and MSN Adcenter.
In Google Adwords, I start off with a list of exact match keyword phrases, then I take the good peforming keywords and add broad and phrase match of those keywords. Should I do the exact same thing in Yahoo Search Marketing and MSN Adcenter? Or should I just use broad match for all the keywords since there’s going to be less search volume on Yahoo and MSN? Is there any other significant difference between the PPC services that I should note of?

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