Where do you like to position yourself at the start of a race? I like to be about 4 people deep in order not to get in the way of the faster runners - they can be unforgiving if you get in the way of their fast starts!
Generally start really quite far back and take the first two miles slow - especially in longer races (HM or longer).
Love the feeling of doing the first half steady and coming past people the whole second half.
Best ever was starting the Kingston 16 miler with the ladies rather than gents - so for 16 miles I was catching up with and overtaking blokes who'd started 10 minutes ahead of me... (I did actually have an excuse for starting with the ladies - I was officially trying to use the RW pacers)
In road races I'll settle for the middle of the pack so as not to go off too quick.
Cross countries are different....narrow paths, styles and gates can slow you down. Hence I start as near to the front as possible and go hell for leather for as long as possible. By the time I need to slow up the field has normally spread and styles etc are less of a problem.