Althoug MSN is lagging behind both Yahoo and Google when it comes to the ways you can get your site indexed, it is still one of the top three search engines, and it should not be ignored.
MSN offers you two different ways to get your site indexed, and you should submit to both. However, before you do that, make sure that you have optimized your website first.
You can get more information on optimizing your site for MSN, as well as tips on search engine optimization, here:
http://www.submit-it.com/subopt.htm
The tips that you will find here basically apply to optimizing your site for any search engine, but they are definitely worth the read so that you focus your search engine optimization efforts in a way that will get your site indexed.
As I mentioned before, there are two ways to get indexed by MSN. The first involves submitting to the Intomi index. The Intomi index actually powers the MSN search.
Inktomi is now also part of Yahoo. However, you should still submit your site here. This will allow you to get indexed by hundreds of sites if your site is accepted.
http://submitit.bcentral.com/msnsubmit.htm
You will need to...