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What I have noticed is the reviewers seem to like blogs as part of a site. Make sure your site is looking spiffy, no bad links, everything working right and then give it a go.
What it is worth is another issue - I get virtually no visitors from the directory, even for the two "cool" sites which appear at the top of their categories. But it's a link, and if you get it easily from a good source a link is always worth having.
You will start appearing on scraper sites all over the place as soon as you are listed - though I have not been aware of that doing any particular harm.
At the end of the year I decided not to renew for another year, not because I did not believe in Yahoo directory, but I could not see spending all that money again to renew for another year.
To my surprise my listing still is in the directory and has been ever since even though I decided to cancel the paid version.
Now I don't know if my site has been over looked or if their policy is once you have submitted and paid for it at least once maybe they keep it in their directory.
Not sure but its a true story.