From my experience with Suzuka track there are quite a few tricky corners. The 2 most important corners in my mind are the first 2 right handers and the last 2 going onto the final straight.
The first 2 corners you want to do the majority of your braking in the second corner, try not to brake so much the first one it's not much of a turn and you don't need to brake that heavily into it, more inbetween the first and second. If you brake to much in the first corner you will loose a lot of time, try hotlapping it and you will see how much time you will gain or loose by doing this.
The last 2 corners going onto the main straight try to think this. Sacrifice the first corner for the next one. Your main goal is to get out of that 2nd corner as fast as you can, so you have a great speed onto the main straight. You can hit that first corner in the S curves really fast, and feel like your going faster or getting ahead but, if someone behind you hits that first corner slower comes out of the 2nd one faster he will pass you on the straight with greater speed and leave you in the dust.
The "Spoon Curve" as it is called (look in the sticky thread above for pictures of the tracks) is also a very weird turn. Once again the first part of the turn is very routine, but the 2nd part is very crucial, you must do alot of your braking before the turn, and get on the accelerator as quickly as possible because there is a very long straight, and you want to get as much speed as possible going down that straight. If for example you brake later and get through the turn quicker then someone that brakes earlier, once again you will be passed by the person that has broken earlier, and accelerated sooner by having more SPEED down the straight. Let me tell you can gain a lot of extra time by taking these corners these ways, suzuka has a lot of long straights so it requires a lot of early braking exiting faster, some tracks you can trail brake, or brake later.