As everyone has said, they both have their places in the business. Optical disc provide you with a quick way of passing info around. Most persons carry sensitive data on a thumb drive and will think twice about sticking it in any and every PC!
RIG: i5 Quad CPU @ 2.67GHz | Gigabyte P55A-UD3 Mobo | ATI Radeon HD 5750 | WD 500GB HDD | Samsung 160GB HDD | Maxtor 160GB HDD | Samsung 120 GB HDD | Segate 160GB external HDD | Corsair 2 x 2GB DDR3 PC3 10666 | G.Skill Ripjaws 2 x 4GB DDR3 PC3 10666 | LG DVD RW+- | 700Watt OCz ModXstream Pro PSU | 17" Proview Widescreen | 32" Viore Widescreen