Keep a validated HTML code. It is recommended to check the site code with several validation software's and or browsers.
Keep your URL as simple as possible, Statistic shows that Msn emphasize the significance of one-two words domain name.
Use Robots.txt file methods to avoid unwanted indexed pages and/or direct Msn crawler to a non-indexed page on your site.
A web page according to Msn, should weight up to 150K (with no pictures).
Every page should be two or max three clicks away from your home page.
Don’t spam the Alt attributes with keywords. Keep it descriptive.
The Keywords tag, together with the Description and the Title tags, are being compared. Keep them relevant and short.
Unlike Google, Msn don't take the Description tag as its short description of the site in the result pages. It is automatically generated from your site. Keep it descriptive and full of relevant content.
Add a descriptive text on the top of every page. Make sure every page has its own goals and content.
Msn does not revile the sites site rank. The only way check your site PR on MSN new search engine (or as they call it – Site rank), is to compare between two sites – use the command link: for two competing domains and by the number of the back links Msn displays, you can calculate the approximated site rank.
As for now, Msn search has a lot of problems as a search engine competing with Google and Yahoo. Nevertheless, this new search engine is going to be a part of Windows Vista and is already a part of Live.com – the new online operating system and office programs by Microsoft.
Finally...someone who understands live.com