In August, Windows Search 4.0 (WS4) was released to the masses. According to recent tests, the performance improvements were significant: 26 percent faster for Windows XP and 84 percent for Windows Vista. We already know that WS4 will be bundled in Vista SP2, so it's natural to expect that the Windows 7 Find and Organize team is using WS4 as the base for further improvements.

http://arstechnica.com/journals/micr...o-beyond-local