I've never had that problem Sacco, sticking to my own pace is probably the one thing I'm really good at - in fact I could be a pacer for dead slow runners 
As long as you're in the right start pen for your predicted finish time you sould be surrounded by people running at a similar pace. Ignore the ones that speed off, they are either a) late, b) had no idea of their pace but have discovered in training that they can go faster c) have been completely unrealistic about their predicted finishing time - you can wave as you overtake them at mile 17 when they will have run out of steam 
Pingu, I started training for the BUPA 10,000 in January and all was going well. Got up to 5 miles (so close!) then got a hip injury. Then got ill. Then pulled a muscle in my back which was stupidly painful for about a month. Have been getting back into it gradually since September - so far so good. I had a deferred place so I knew this was coming!
Great idea about doing what you feel like now and then, it keeps you fresh. Sometimes I do just go out and run without a watch. Last week I went for a long walk instead of a short run - you have to mix it up to beat boredom.
I'm a bit less of a wuss about hills than I used to be too, so that gives me more variation when it comes to routes than the last time I trained for a marathon. It all helps 
Edited: 01/11/2011 at 10:06