msn usually indexes fast, do a little bit link building , submit url to msn and create a sitemap, also msn site owner page may be helpful: http://search.msn.com.my/docs/siteowner.aspx?t=SEARCH_WEBMASTER_REF_GuidelinesforOptimizingSite.htm&FORM=WGSM
If you do a little link building campaign and you wont even have to submit to any of the engines. MSN will pick you up the quickest if you get into some quality directories!
yes i know. i can say that i already have lots of links. MSN actually indexed my site today. But i changed something from my site after the indexed and I am 100% sure that if msn index my site again soon i'll rank well for a particular keyword. So i really need MSN to indexed my site within 24 hours..
It has a direct effect on your visibility and ranking, please read this recent artcle: http://www.wilsonweb.com/seo/ross-sitemaps.htm
remember to submit your feed to em, as well as submit to a few of the free RSS feed directories such as feedbomb.com and feedboy.com which will get you a hardlink on a PR page.