In google there is a simple spot to change your address from one domain to a new one. Where is this option in Yahoo? Is it best to just submit the new site and sitemap and then delete the old ones or is there a button that I'm missing (like google has)?
In google there is option to change the address, in case of redirection. But in yahoo there is no option. You submit new site and delete the old one which is not required.
Yahoo site explorer counts back link from each page of site as a single backlink. So may be you used blog posting for getting backlinks and the backlinks were counted from all pages of blog (I dont know why this happens but for 1-2 weeks after you comment on blogs you get backlinks from all of their page) and now the backlink is counted for the only the page where you commented.
Yahoo webmaster tool is diffcult to use than Google webmaster tools, anyway . you can do by adding or deleting website from Yahoo site explorer. find on Google submit website in yahoo webmaster tool you will get actual link.
Add the new site and delete the previous one. Once you get the hang of using Google's Webmaster Tools using Yahoo is never quite so easy.