There is an interesting thread taking place at WebmasterWorld named Yahoo's re-review process. The topic is not as interesting as the pattern seen in the thread. The topic is basically about how Yahoo! is slow to respond or unresponsive to "re-review requests" submitted through the Yahoo! Search - Second Review Request form. I do not blame Yahoo! for not being so responsive to these requests, the other engines are not, so why should they?
The topic that interests me more is that there is a pattern being seen in that thread of people reporting that Yahoo! has only indexed their home pages and possibly a second page - but no more. The thread creator said, "I specified that the site was listed in the index, but only the home page." An other member reports that "They have gone from having 2 pages in the index to 49 now" after using the form. Yet an other said, "If they arent going to index more than my homepage I might as well ban slurp from my sites all together!" And an other, "I just did a site:widget.com, and also just found my homepage listed as well."
Often with cases like this, there are some sort of filters, like duplicate content filters, that cause this event. However, I have a specific site that I am working on that has the same issue. I have been in discussion with the folks at Yahoo! about it, but I have not received anything solid as of yet. We believe that it had to do with a previous domain name being used as an alias to the, now, main domain name. But no improvement on the indexing as of yet. In addition, the site is purely unique from content, html, layout, colors and everything. Oh, and its very white hat. As soon as I hear anything that I can share, I will share.