What kind of question is this??? We all do! I mean, there's nobody in the world who haven't heared about Timothy Leary, John Lennon, Jimi Hendrix, Janis Joplin, Jim Morrison... I'm kinda confused...
Turion there are plenty of current threads on this matter to be found... you'll find your answer there.
I know a book that will help give you an idea about the culture. Its called hippies from A-Z by Skip Stone. I think this is an awesome book, it gives alot of interesting information.
Dennis Hopper is a hippie and so is Peter Fonda, old hippies maybe, but hippies none the less Ram Das is beyond hippie but very much hip.. I don't know any young famous hippies.. Tim Leary was the first I think to really open up the hip scene..
Though his "hippiedom" is arguable, he is one of todays most well respected activists and is a very very famous political/philisophical writer, maybe you've read some of his books, Noam Chomsky.