As the others have said, a pound is fab - squiddie is quite right, it's nearly 4 stone in a year. We expect so much when we lose weight, it didn't go on over night so we can't expect to lose it overnight.
Upping your exercise will not make it drop off super fast, it will not double your weight loss. My consultant told us it will account for about an extra stone a year which is only a pound a month (or therabouts) so 1/4 lb a week. Exercise will tone you up and make you feel better but don't expect miracles from it on the weight loss front.
A pound is great, it's the SW "perfect pound" - keep losing them!