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As for how strong a referrer it is that all depends on your target audience etc. It's about 40-50% of my referrals for a couple of my sites.
That said - there is absolutely no reason to not be in AOL since ODP is a free listing. ODP ---> AOL is a must for any effective SEO campaign.
Point of interest:
search.aol.com referrals stopped
aolsearch.aol.com referrals still coming in but very few. search.aol.com was a better referrer for me.