Intel era

Apple discontinued the use of PowerPC microprocessors in 2006. At WWDC 2005, Steve Jobs revealed this transition and also noted that Mac OS X was in development to run both on Intel and PowerPC architecture from the very beginning. All new Macs now use x86 processors made by Intel, and some Macs were given new names to signify the switch. Intel-based Macs can run pre-existing software developed for PowerPC using an emulator called Rosetta although at noticeably slower speeds than native programs, and the Classic environment is unavailable. With the release of Intel-based Mac computers, the potential to natively run Windows-based operating systems on Apple hardware without the need for emulation software such as Virtual PC was introduced. In March 2006, a group of hackers announced that they were able to run Windows XP on an Intel-based Mac. The group released their software as open source and has posted it for download on their website. On April 5, 2006 Apple announced the public beta availability of their own Boot Camp software which allows owners of Intel-based Macs to install Windows XP on their machines; later versions added support for Windows Vista. Boot Camp became a standard feature in Mac OS X 10.5, while support for Classic was dropped from PowerPC Macs.
http://en.wikipedia.org/wiki/Macintosh#2006_onward:_Intel_era

This is a link where  you can watch  a  evoluction of teh mac's computer and laps 

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