May have been covered already but when approaching corners (I'm talking your regular suburban 90 degree corners where little kids or oldies could be crossing) slow down early and change down into second. You should try to be in gear as much as possible.
I'll tell you a story from my experience that made me realise the importance of this. Once I was approaching a corner that I needed to take. I was on the main road turning off so I put the brakes on, pushed the clutch pedal down and started to go around the corner, essentially in neutral as I had not down shifted and put the car into gear, as I was rolling around the corner a car from the small street I was turning into came out and as I was going a little fast without the car in gear I had no control of my car as I couldn't use the accelerator to pull the car around and it kind of wandered through the corner (major understeer). Luckily the other car saw me coming around the corner and slowed down to give me plenty of room to hall my hatchie around the corner, but it could have easily ended in a head-on collision. Had I been in gear I could have pulled my car around the corner much more effectively.
It's all well and good to be able to use advance driving techniques but best bet is to take it easy and try to prepare the car and your actions for the road ahead. When you think about it even the best racing drivers in their race spec vehicles have accidents so is it realistic to think that we, with all our driving experience, will be able to avoid an accident by using these race techniques on our crappy public roads with people around, in a car that isn't set up like these race spec machines? I'm not trying to dis anyone and my hat's off to any successful racing car drivers among us, but I'm a young driver who is well within the statistics for young male drivers and it is just too easy to have accidents.