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MSN has banned manu sites using Adsense
Not for me it has not...my MSN SERPs make it look so spammy it's crazy.
MSN is spidering fast, no sandbox!, and actually giving good results however too many duplicates and related results from my own sites which Google "knows" are different therefore not relevant to the query.
after addind adsense to my site, My MSN rankings have dropped
I asked the same question. My rankings have plumetted on both MSN and Yahoo since adding Adsense, yet were relatively stable on both SEs for the preceeding 3 years.
Fingers crossed it is just coincidence. On the plus side, my Google traffic has gone up to compensate!
If you had your website running for years and your placement dropped - still I think its other reason then adsense (could be new competition etc...).