I usually get like 10-15 searchs from msn to my site, today i got 0 The only thing that is good is google usually brings 5-7 to my site, today i got around 15 and same thing with yahoo...
In my experience, MSN will drop rankings on pages with old content if a targetted page comes around with fresh content. Doesn't seem to last, but fresh content definitely gives a boost.
My read is that Google jumps the most, then MSN, then Yahoo..... It seems like Yahoo never changes. MSN seems to have a very temporary sandbox that whenever I change my page in the slightest, I lose rank for about a week then make a comeback.
For me, Google > MSN > Yahoo. MSN doesn't jump around as much for me, but when it does jump, they will sometimes completely take me out of the index, then a week later, I come back higher than before.