Many people have pointed out that the scary thing about Microsoft potentially buying Yahoo is that Yahoo owns many important web sites (Flickr, del.icio.us, upcoming.org, etc.) and supports many important open source projects (PHP, FreeBSD, YUI, Hadoop, Squid, etc.) I'm not worried, though. These days Microsoft is so ineffectual that it would take them at least a decade to ruin all of those sites and projects.