Interesting: I had a few sites that dropped off Yahoo Radar as I redirected non-www to www e.g. [sitename.com...] to [sitename.com....]
For one site it's taken just on a month to get back in with www. instead of non-www. The rankings stink but at least they are top 100. Not sure if they stink due to the "mild update" or that it's not getting credit for all factors yet.
I'm assuming the 2nd and will update this if I learn more.
Couple points: - Other site nowhere to be found, but it's bigger and I reorganised half the internal URLs as well during that time. - Still no deep crawl on them (or other sites) in well over a month. - Main lesson, always get that www. in there from the start. Stupid me, *sigh*.
I hear your pain. In my early days I got a DMOZ entry on the non-www for my home page URL. Once I put a 301 in Google figured it out very quickly. Yahoo took its time but eventually indexed my site correctly.
I think you can rest assured that your sites will recover and be better off than before.
Ive found Yahoo is pretty stupid (deliberately). If you cannot wait and find your site will not be indexed properly in Yahoo. There is a solution. They have a program, which I feel undermines their credibility as a search engine, called Yahoo Search Submit. The program works so basically you pay to have your site indexed properly and then have to pay per click for clicks you receive from the organic search results. My strategy is to stop paying per click as soon as I have had my site indexed. If your content isnt always changing you won't really need the fresh crawling that comes while you have credits in your PPC account.
Sadly, this can be a relatively cheap and easy way to get yourself back in the Yahoo index properly.