Business use quarters to split up their year. 1st quarter is the first 3 months of the year (Jan, Feb., Mar.). 2nd quarter is Apr, May, June. 3rd quarter is Jul, Aug, Sept. 4th and final quarter is Oct, Nov, Dec.
I'm thinking the 7800GS may help to drive prices down because it gives us more options to buy video cards. A much more wider variety. Since Nvidia will be making a profit off of the 7800GS, I'm sure they won't mind a slight price drop on their other lines of video cards to get more people to buy them instead.