Rally continues... Sensex up 606ptsBS Reporter / Mumbai September 19, 2007The Sensex is now up 606 points at 16,275.HDFC has zoomed over 8% to Rs 2,360, and HDFC Bank has soared 7.5% to Rs 1,322.Bharti Airtel, ONGC and Maruti have surged over 5.5% each to Rs 880, Rs 899 and Rs 923, respectively.Bajaj Auto has rallied nearly 5% to Rs 2,517. SBI, Reliance, Reliance Communications and Tata Steel have advanced around 4.5% each to Rs 1,773, Rs 2,154, Rs 562 and Rs 742, respectively. BIG GAINS