SMA OPERATED ON AN AIRWAY IN CLOSE PROX TO A BUSY ARSA WITHOUT ATC CONTACT.

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I WAS ON V8 FROM PDZ VOR ENRTE TO SLI VOR. I HAD STARTED A DSCNT FROM 6500 FT TO 4000 FT. DURING MY DSCNT; I NOTICED A TOTAL OF (3) OTHER ACFT IN VICINITY. ACFT 1 APPEARED TO BE AN MLG; PARALLEL TO MY COURSE; SLIGHTLY BELOW ME AND ABOUT 1 1/2 MI TO MY L SIDE. HE TURNED L AND APPEARED HEADED TO SNA ARPT; ORANGE COUNTY. APPROX 1 MIN LATER; I SAW AN ACR A MLG APPROX 500 FT BELOW ME; ABOUT LESS THAN A MI TO MY L; BUT ON A GENERALLY RECIPROCAL HDG TO MY OWN. HE WAS CLOSE ENOUGH FOR ME TO READ 'ACR A AIRLINES' ON THE SIDE OF THE FUSELAGE. ACFT #3 APPEARED TO BE ANOTHER MLG. I WAS ABLE TO SEE THE LOGO; BUT COULD NOT MAKE IT OUT. HE FOLLOWED ACR A INTO SNA. MY FLT WAS UNDER VFR RULES AND CONDITIONS. I WAS ESTABLISHED ON V8 AT 4500 FT SWBOUND. I DID HAVE A FLT PLAN ON FILE FROM PALM SPRINGS TO TORRANCE; BUT I WAS NOT USING VFR FLT FOLLOWING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: COUNSELED RPTR ABOUT FLYING CLOSE TO TCAS AND ARSAS. CONSIDERING HIS LOW TIME; HE SEEMS TO BE VERY CAREFUL AND SAFETY CONSCIOUS.