Say goodbye to 10-cent minimums on Yahoo. The company has started tweaking the minimum bid requirements for its Yahoo Search Marketing text ads, so they will now be calculated based on market demand and ad quality scores.

Mediapost's Tameka Key quoted a Yahoo spokesperson as saying the move was designed to "More to more closely align keyword bids with the value and relevance associated with those keywords."

On SearchEngineLand, Barry Schwartz offered some screen shots of the new alerts you'll see for any key terms affected by the change. He also provided a number of guidelines for keeping your click costs low and your ROI high.

As with past minimum-bid increases, few high-volume positions will be affected by the change, as market forces have already pushed the effective key terms well above the 10-cent floor.