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Inktomi - may explain why you aren't getting Yahoo! traffic. Inktomi customers don't get Yahoo! traffic.
OSM - are you getting MSN traffic? AV or Fast? If yes, unlikly you have a penalty.
Are you stil ranking in Yahoo!? If you search for your main keywords, has your ranking decreased? Do you still show up at all?
That is Pay for Inclusion. The old Inktomi PFI.
This has been replaced by Overture Site Match, which provides organic results to Yahoo! and various other protal partners.
So if you are in Inktomi PFI, you may not be included in OSM, because you haven't paid to receive that.
How are you checking your site is in Yahoo!? Simply doing a search for your domain name will not work. Try searching for your web page title and see where you rank.
And finally, Google Adwords will have nothing to do with getting traffic from Yahoo! You would need to be doing Overture Precsion Match to be getting Paid Placement on Yahoo!