Finally! It appears Yahoo reads this blog and answered Barry's prayers, but Yahoo Site Explorer looks like it just went live. I am including a screen shot for verification. Barry has been diligently watching and documenting Yahoo Site Explorer progress like a kid waiting for an ice cream truck, so I hope he doesn't hate me for posting on this for him. I just checked the site and I am able to plug in URL's and get results. Such as a site check tool listing all pages from a website, and also more detailed stats for what Yahoo calls "Inlinks" or backlinks to the website.
This tool enables users to check linkage data and bulk submitting of urls to Yahoo.
Check it out: http://siteexplorer.search.yahoo.com/
From coverage at SES here is a recap of what it includes:
Yahoo Site Explorer is a place to see which pages Yahoo has indexed. After clicking "Explore URL" you'll find the number of pages found in the Yahoo Index and also the number of inlinks. You can sort pages by "depth," submit URLs, and quickly export the results to CSV format. Site Explorer is also supported via an API.
Except a more thorough overview from Barry when he gets back.