Going to try and be critical, I put my pictures up for a grilling on some forums and although it seems incredibly harsh, it does wonders compared to the "great pics" comments, which although good to hear, don't really help you improve. I respect that it's as much personal preference as anything else, but these are my thoughts...
Whilst technically very good, there is a lack of that certain something about many of the pics. The green BMW and Valver have something that many of the other pictures lack, they both look aggressive and really show the strains of a trackday on a car. The low angle helps a lot too.
They are all too perfect. An odd comment perhaps, but if you thumb through a copy of Evo or something you don't often see a standard perfectly sharp pan. A bit of blur can add to a picture immensly. I varied my speed of movment mid-pan and realised it gave an interesting effect, such as below. It depends what you want from your pictures I guess, but it's good to experiment.
Something along those lines would be good to see. It's easy to tell the difference between just completely messing up a shot, and trying to show the sense of speed in a different way, so I don't worry about people thinking it's just a crap shot.
Finally. What are you trying to achieve? A record of the day or some great shots for your collection? If it's the latter I found stepping completely outside your comfort zone works wonders. I forced myself to take only 1/100 or slower during a whole day at Combe once for side-on pans, and whilst I had many many shots to bin, the few that I started to get towards the end of the day when I nailed the technique are some of my favourite pics ever. You forget 500 decent pics, but 3 or 4 stunners will stay with you for a very long time.
