Changes always hurt some site and help other sites. Always. It's a zero-sum game. Webmasterworld always amazes me with discussions of "good" updates and "bad" updates. All updates are both good and bad.
Update was bad for MSN, just like the update today was bad for Yahoo. This puts Google back on top now with more bad results. Seems like search engine results are going down hill with results trying to fight spam. Looks like Ask.com is doing the best right now and has good results.
I was one of many hurt in the Google rankings by some kind of Google update on June 27. But my MSN rankings have gotten better, especially over the last few days. I have been told by others that they have experienced the same thing. Could there be a relationship? Doubtful, but it seems like an interesting coincedence.
Apparently MSN did some kind of algo change right after Alexa & Amazon switched over to their database. My sites dropped and now the results are not very useful (not just because my sites are not there). I see many duplications and link farm sites, almost as bad as Yahoo. They also don't seem to be doing any indexing updates and it's getting very stale. According to my server logs if 20,000 hits come from Google, then 2,000 come from Yahoo and 200 come from MSN. Is always been that way so I don't much care. I for one simple don't use their search. I usually don't find what I'm looking for anyway. If Microsoft's search engine is as good as it's OS, then less than perfect results should be no surprise.