there is a clear fight between google,msn and yahoo. google is a giant and it wants to offer its user the data what they are searching for so they allow yahoo groups, msn blogs as well as any other pages which contain the desired keyowrd or keyphrase whereas msn and yahoo try their best to not allow google blogger (blog)results as well other websites to get inserted in it too fast. even if your blog is in a better ranking in google it will sure be outstand from msn and yahoo results, algorithm also differs
I used to say the same "live search sucks," and it pretty much brought just about 10% of traffic (that is also roughly the market size that they have) but after some recent improvements they are sending a lot more traffic my way and this is not at the expense of other search engines. I still don't worry about them - the best trick is to focus on G and forget the rest.
MSN doesn't crawl alot.. --------------hits-----bandwidth-- MSNBot.........7+6.............99.15 KB Googlebot......2301+24...... 16.36 MB Yahoo Slurp....344+56..........4.25 MB Google is the best search engine becuase they are the crawling everything! 24/7 they probably have the entire internet crawled.