FLC OF LR35 HAVE NMAC WITH BARON ON VISUAL APCH TO APA WHILE FLYING BELOW CLASS B AIRSPACE.

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WHILE TALKING TO DEN TRACON ON APCH TO APA; WE WERE ASSIGNED A HDG AND AN ALT OF 9000 FT. APCH CTLR WAS BUSY CALLING NUMEROUS TFC FOR MANY AIRPLANES. SUDDENLY; WE SPOTTED A TWIN ENG AIRPLANE VERY CLOSE AND ON A COLLISION COURSE. WE SPOTTED THIS TFC JUST AS THE CTLR CALLED IT OUT TO US. AN IMMEDIATE AND VERY RAPID CLB WAS PERFORMED TO GO OVER THE TFC; WHICH WAS ON A NEAR OPPOSITE COURSE. OUR ACFT CAME WITHIN 500-700 FT OF EACH OTHER. 1 PAX SUFFERED A BROKEN LEG AS A RESULT OF THE MANEUVERING. THE EXTREMELY CROWDED APCH CTL FREQ; AND THE VERY CROWDED AIRSPACE UNDERNEATH THE CLASS B AIRSPACE CONTRIBUTED TO THIS INCIDENT. BOTH PLTS WERE BEING EXTREMELY VIGILANT AND LOOKING OUT OF THE AIRPLANE; ONLY THIS VIGILANCE PREVENTED DISASTER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE WAS ABLE TO COM WITH TRACON SUPVR AFTER LNDG. SUPVR TOOK A RPT FROM HIM AND EXPLAINED THAT THERE WAS A VERY INEXPERIENCED CTLR ON DUTY AND HE WAS HANDLING A GREAT DEAL OF TFC. HE NOTIFIED THE RPTR AS SOON AS HE WAS ABLE. BY THAT TIME THE ACFT WAS ONLY 1 MI AWAY. THE BARON WAS NOT IN CONTACT WITH ATC AND WAS LEGAL SINCE HE WAS BELOW THE FLOOR OF THE CLASS B AIRSPACE. THERE WERE NO VIOLATIONS; CONSEQUENTLY NO FAA ACTION; EXCEPT THE ATC RPT OF THE INCIDENT.