CAPT OF A SAAB SF340 TAXIED PASSED THE HOLD SHORT LINE DURING TAXI OUT CAUSING THE TWR CTLR TO CANCEL TKOF CLRNC FOR A LEARJET ROLLING.

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GND INSTRUCTED US TO TAXI TO RWY 7. ENRTE TO RWY 7 THE CAPT INADVERTENTLY TAXIED ONTO THE RWY MISTAKING IT FOR THE PARALLEL TXWY. THE FO WAS HEAD DOWN DETERMINING TKOF DATA AND DID NOT OBSERVE THE CAPT TAXI ACROSS THE HOLD SHORT LINE. GND OBSERVED OUR ACFT XING THE HOLD SHORT LINE AND IMMEDIATELY TOLD US TO CLR THE RWY. SIMULTANEOUSLY; TWR INSTRUCTED THE LEAR TO ABORT ITS TKOF ROLL. CONTRIBUTING FACTORS: THE 'BEFORE TKOF CHK' IS ACCOMPLISHED ENRTE TO THE RWY AFTER THE ACFT HAS DEPARTED THE GATE AREA AND BEFORE THE ACFT CROSSES THE HOLD SHORT. AMONG OTHER THINGS; THE 'BEFORE TKOF CHK' REQUIRES THE FO TO LOOK UP 3 ITEMS (TKOF PWR SETTINGS; TRIM SETTINGS AND V SPDS) IN 3 DIFFERENT PUBS. THIS IS TIME CONSUMING AND DOES NOT ALLOW THE FO TO DEVOTE HIS/HER FULL ATTN TO ASSISTING THE CAPT IN TAXIING THE ACFT TO THE RWY. CORRECTIVE ACTION: THE CAPT AND FO SHOULD BRIEF A TAXI PLAN DURING THE CREW BRIEF. ONCE A TAXI PLAN IS BRIEFED AND COMPLETELY UNDERSTOOD; BOTH THE CAPT AND FO WILL BE MENTALLY PREPARED FOR TAXIING THE ACFT TO THE RWY. TKOF DATA SHOULD BE LOOKED UP WHILE THE ACFT IS STILL AT THE GATE. IF DATA ARE DETERMINED AT THE GATE; THE FO WILL NOT BE HEAD DOWN FOR AN EXTENDED PERIOD OF TIME WHILE THE ACFT IS TAXIED TO THE RWY.