Marcelo Lippi
No need to present him on a Juventus forum. Talent, loyalty, class.
Raymond Goethals
Bit of national pride here. The Belgian Sorcerer, best known for leading Marseille to win France's only CL, was an amazing tactician and man leader, IMO one of the best ever. He won various league titles, brought to Anderlecht to win a European cup, Belgium to the 3rd place of the Euro, only to be stopped by the eventual winners (Germany, in '72).
Guus Hiddink
Winning six league titles and four cups with PSV is good, bringing them the CL (1988) is exceptionnal. But Guus is better known for his national teams' successes. 4th in a WC with Holland, idem with S-Korea, 1/8th final with Australia, 1/2 final of the Euros with Russia. This can't be a coincidence, can it?
Alex Ferguson
This guy is ManUtd's coach since 1986. Love it or hate it, but he did a formidable job there. 10 leagues, 5 FA cups, 2 Cl's ... need I say more? Oh, he also led Aberdeen to three SPL titles.
Rinus Michels
Totalfootball. If you thought EURO2008-Holland was nice to watch, you should've seen Michels' squads. He led Ajax to huge successes and won the EURO with Holland. Of course, as a succesful Dutch Ajax coach, he ended up in Barca, winning the league. More than his successes, it's the beauty of his game that is revered. I wish I'd seen that live.
Ernst Happel
Maybe the best ever. This guy won several national titles and cups in Belgium, Austria, Holland and Germany. He led Feyenoord and HSV to their only CL victory (with Hamburg he beat the mighty Platini - Juventus in '83) and also brought Holland to the WC final.