B767 ON ILS RWY 27R AT ORD AT APPROX 2200 FT OBSERVED TCAS HELI TFC; COMMENTING THAT ATC WAS LESS THAN INFORMATIVE REGARDING TFC INFO.

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IT HAS COME TO MY ATTN THROUGH YRS OF PERSONAL OBSERVATION THAT O'HARE INTL ARPT HELI OPS HAVE BECOME TOO LIBERAL. ON APR/XA/07 AS THE CAPT OF A B767-300; WHILE DSNDING ON THE RWY 27R ILS AT 2 MI FROM TAFFS; I OBSERVED A TARGET ON MY TCAS MONITOR APPROX AT TAFFS. THE TARGET WAS BELOW MY CURRENT ALT AS I DSNDED ON THE GS TOWARD TAFFS. IT WAS DAWN; THEREFORE DARK AND I COULD NOT SEE THE TARGET VISUALLY IN THE GND CLUTTER OF THE CITY LIGHTS BELOW. I ASKED APCH IF HE HAD A TARGET AT TAFFS. THE CTLR RESPONDED BUT DID NOT ANSWER MY QUESTION. HE DID NOT SEEM CONCERNED ABOUT THE TARGET. I ASKED HIM AGAIN AND INSTEAD OF SHARING INFO AND TELLING ME IT IS A HELI IN HOVER OR A HELI MOVING L TO R; THE CTLR SAYS IT IS A HELI UNDER TWR CTL; SWITCH TO TWR FREQ. I DO NOT REMEMBER EXACTLY WHAT THE TWR CTLR SAID ABOUT THE HELI; BUT IT LEFT ME WITH THE IMPRESSION THAT THE HELI WAS CLR OF THE RWY 27R ILS CORRIDOR. THIS HELI WAS AN UNEXPECTED DISTR DURING MY APCH AND FROM THE INFO I OBSERVED IN THE COCKPIT APPEARED TO BE LEGITIMATE CONCERN. TCAS DID NOT GENERATE ANY TA OR RA ALERTS. THIS WOULD HAVE BEEN A GOOD TIME FOR APCH CTLR TO GIVE AN UNSOLICITED TFC CALL DURING A CRITICAL PHASE OF FLT WELL KNOWN FOR ITS DANGERS. I BELIEVE THIS CAVALIER WORK HABIT TO HELI OPS LED TO MY NOT GETTING A TFC CALL ON MY APCH. I AM NOT FAMILIAR WITH HELI PROCS IN A CLASS B. CERTAINLY HELI OPS IN ANY CLASS B ARE NECESSARY. AS A MINIMUM; A CHART DIAGRAMMING ESTABLISHED HELI CORRIDORS AND ALTS SHOULD BE ADDED TO THE O'HARE CHARTS.