SMA PLT FLEW AN INAPPROPRIATE HDG FOR DIRECTION AND THEN ENTERED IAH CLASS B AIRSPACE WITHOUT CLRNC.

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WHEN PLANNING A FLT FROM CFD TO LBX; I HAD USED COMMERCIAL SOFTWARE TO DO THE PLANNING AND THEN ACCESSED THROUGH COMMERCIAL SVC. FLT PLANNER CALCULATED MY HDG AND I INADVERTENTLY USED THE ALT FROM A PRIOR PLAN (4500 FT). I FAILED TO RECOGNIZE THAT WITH A HDG OF 167 DEGS I SHOULD HAVE BEEN AT AN ODD ALT. WHEN I ACTUALLY FLEW THE FLT; I HAD APPROX A 90 DEG XWIND AND HAD TO CONTINUALLY ADD R CORRECTION. EVEN WITH THE CORRECTION; I CONTINUED TO FLY L (E) OF MY COURSE LINE. AT ONE OF MY GND REF CHK POINTS (BROOKSHIRE; TX); I NOTED THAT I WAS APPROX 1-2 MI E AND AFTER LOOKING AT THE SECTIONAL NOTED THAT I MAY HAVE SLIGHTLY ENTERED HOUSTON CLASS B AIRSPACE. I WAS NOT IN CONTACT WITH APCH CTL. I THEN TURNED 90 DEGS R TO COURSE AND MADE SURE I WAS CLR OF CLASS B AIRSPACE BEFORE I TURNED BACK ON HDG. LESSONS LEARNED: 1) NEVER ACCEPT DEFAULT VALUES WHEN USING COMPUTERS FOR FLT PLANNING. I HAVE RECEIVED TRAINING AND KNOW THE PROPER ALTS FOR HDGS. 2) SOFTWARE DOES NOT SHOW VARIOUS CTLED AIRSPACES. ALWAYS CHK A FLT RTE AGAINST A CHART TO MAKE SURE YOU DO NOT ENTER INTO CTLED AIRSPACE WITHOUT AUTH. 3) EVEN THOUGH REGS DO NOT REQUIRE CONTACT WITH DEP WHEN YOU ARE NOT ENTERING THEIR AIRSPACE; IT'S A GOOD IDEA IF YOU'RE EVEN CLOSE SO THEY CAN GIVE YOU A CODE TO KEEP YOU IN SIGHT AND ADVISE OTHER TFC. 4) STAY HEADS UP. DON'T TAKE ANYTHING FOR GRANTED.