SA226 CREW HAD A BE35 ON SHORT FINAL APCH; LNDG NOSE-TO-NOSE AT GVL.

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AFTER BEING CLRED FOR VISUAL APCH TO GVL; WAS SWITCHED TO UNICOM AND CANCELED IFR. AFTER SWITCHING TO UNICOM AT APPROX 5 NM FROM FIELD ON A STRAIGHT-IN APCH; BROADCAST ACFT IDENT; LOCATION; AND INTENTIONS (STRAIGHT-IN FULL STOP). NO ACFT RESPONDED TO POS CALL. REPEATED CALL AT 3 NM STRAIGHT-IN AND APPROX 3/4 -1 MI FINAL -- AGAIN NO RESPONSE TO RADIO XMISSIONS. (WX CONDITIONS: VFR; CLR; 8 MI VISIBILITY; WINDS VARIABLE AT 5 KTS.) AFTER TOUCHDOWN DURING ROLLOUT; I SAW THE OTHER ACFT (BONANZA) ON ABOUT A 1/4 MI FINAL TO THE OPPOSITE RWY (ACFT NOSE-TO-NOSE). BROADCAST ON UNICOM THAT AN ACFT WAS ON THE RWY TO GO AROUND. AT APPROX THE THRESHOLD AT THE OPPOSITE RWY; THE BONANZA EXECUTED A GAR. ESTIMATE THAT GAR WAS INITIATED APPROX 1000-2000 FT AWAY. BONANZA CROSSED OVER MY ACFT AT APPROX 200 FT. AFTER PARKING ACFT; WE WERE INFORMED THAT THE UNICOM FREQ HAD BEEN CHANGED AS OF XA00 THE PREVIOUS DAY. NO NOTAMS WERE FOUND ADDRESSING THE CHANGE IN UNICOM FREQ. IN DISCUSSION WITH THE AIRFIELD MGR; HE COMMENTED 'WE ANTICIPATED THIS KIND OF SIT.' BUT OBVIOUSLY HE DID NOT TAKE APPROPRIATE STEPS TO PREVENT IT. BY ISSUING A CLRLY WORDED NOTAM THAT THE UNICOM FREQ HAD CHANGED OR INCLUDING THE CHANGE IN FREQ ON THE AWOS; THIS SIT COULD HAVE BEEN AVOIDED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: IN COM WITH THE FLT INFO DESIGN ANALYST AT THE COMMERCIAL CHART PUBLISHER. HE INDICATED THE NOTAM FLT DATA DIGEST #207 DID NOT ISSUE THE CHANGE UNTIL OCT/XA/02. THE PUBLISHER HAS ISSUED A NOTAM WHICH WILL BE PUBLISHED NOV/XA/02. THE PLATE PAGE INFO WILL BE RELEASED NOV/XI/02 FOR THE DEC/XA/02 REVISION. THE ANALYST DOES NOT KNOW WHY THE NOTAM FLT DATA DIGEST TOOK SO LONG TO RELEASE THE FREQ CHANGE.