>I would recommend paying for a listing in the Yahoo directory, sometimes FREE is not answer.
If you are looking for commercial services, then USUALLY "free" is not the answer. I personally think in this case Yahoo! may be the answer: but caveat: my profession is not web promotion.
If you're looking for low-bias metadata on websites, then "free" is probably the preferred answer. And the ODP is a likely possibility.
Which leads to some interesting social issues. If "free" is best for surfers, and "paid" is best for advertisers, then what's best for the directory combining them? Who gets the short end of the stick (or, since a stick only has two ends, who doesn't get a bit of it?)
Fortunately, we don't have to answer that question for everyone. Each person has his own choice.