I've developed a well received niche information site over the past 24 months, having spent several thousand man hours at it. The site has a PR of 5, ~ 500 inbound links (many highly authoritative, many .gov and .edu). Google and Bing have received us very well, but Yahoo seems to think we're nothing. HELP... What might be some credible reasons we're not getting indexed well? (We do have 3-4 pages linked it seems). I even spent the $299 for the Yahoo Directory early on, but that seems to have been wasted money.
Any tips or information would be greatly appreciated.