I was just wonder if you have to make Sitemap to each of this famous search engines and put it in the root of your site. Cause, each and every one of them uses different algorythm for crawling pages cause it's a waste if you have to just let traffic from yahoo, and MSN because they are not that popular.....
Each of them accepts .xml sitemaps, and as far as I'm aware you do not need to change the sitemap for each. I submit the same to each and I've never had any problems or issues.
No - you do not need to have a different one for each. They do have different algorithms for ranking the sites/pages but the sitemap is only there to help them crawl your site.