girlsyearapart, I think 2 hours is v impressive, and you should be pleased you were so close to your target!
Peach, I found that my main motivation for longer runs comes from having races to train for, although after my last half (and before I got injured) I started enjoying doing 8-10 miles on a weekend. It was in the summer though - I used to vary my routes and just enjoyed plodding round the local area.
As soon as DH gets home I'm going to force myself out for a couple of miles - need to more miles in my legs before I try to go back to my running club. How do you all motivate yourself when it's dark and cold? Is it just mind over matter?