PLT OF A C180 INADVERTENTLY CLBED INTO CLASS B AIRSPACE DUE TO A CHANGE OF VFR DEP ROUTING FROM AN UNDERLYING ARPT. HE EXITED THE AIRSPACE AFTER NOTING IT HIS ERROR.

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I LANDED AT XX30 AT PAO IN A GUSTING XWIND OF 10-15 KTS AT A 40-50 DEG ANGLE TO THE RWY. INTERESTING; BUT NOT PARTICULARLY CHALLENGING. AFTER THE PAX ARRIVED; WE LOADED AND DEPARTED WITH A XWIND OF 15-22 KTS FROM 45 DEGS. THE TKOF WAS VERY DIFFICULT WITH AN ABILITY TO MAINTAIN RWY CTRLINE. I HAD INTENDED TO MAKE A R 270 DEG DEP AND HAD LOOKED AT THE MAPS FOR THE CLASS B; C; AND D AIRSPACE RESTRS ALONG THE PLANNED DEP RTE OF 120 DEGS. AS I TOPPED OUT; I OBSERVED THAT THERE WERE A NUMBER OF OTHER ACFT IN THE PATTERN AND THE HIGH LENTICULAR CLOUDS PARALLELING THE PLANNED RTE INDICATED I WOULD POSSIBLY BE IN THE SINK SIDE OF THE WAVE IF I KEPT TO THE ORIGINAL 120 DEG DEP RTE. I THEREFORE DEPARTED AT 300 DEGS FOR 4 MI; THEN TURNED TO 250 DEGS FOR 5-10 MI; CLBING AS I WENT TO GET TO THE LIFT SIDE OF THE WAVE. THE ORIGINAL RTE HAD A CLASS B FLOOR OF 6000 FT AND A CLASS C TOP OF 4000 FT. THE NEW RTE HAD A 4000 FT CLASS B FLOOR. I WAS DISTR THINKING ABOUT THE DIFFICULT TKOF; AND BY LISTENING TO THE TWR AND OTHER PLTS TRYING TO LAND IN THE GUSTING XWIND AND SHEAR CONDITIONS; AND BY TRACKING THE LENTICULAR TO GET INTO THE LIFT. ON PASSING THROUGH 5000 FT (1000 FT INTO CLASS B) I CHKED THE MAP AND FOUND MYSELF IN THE CLASS B. I DSNDED TO 3900 FT ASAP. I SHOULD HAVE CHKED THE NEW RTE PRIOR TO TKOF. I SHOULD HAVE CALLED BAY INSTEAD OF LISTENING OT THE OTHER PLTS' DIFFICULTIES.