Neutrogena has worked for me up to this winter - new baby therefore constant hand washing plus central heating etc. Baby has dry, sensitive skin too, and she was prescribed a massive tub of Diprobase. Sadly she can't use it (too sensitive ), but it's bloody amazing hand cream for me!
I also recommend L'Occitane Almond exfoliating paste - will help smooth the rough skin on your hands while moisturising amazingly. And smells divine. Will help your hands absorb whatever amazing cream you choose to apply to them no end.
(I'm so buying loads of the stuff recommended on this thread. It all sounds so good)
Another vote for purenuffstuff and also try hand cream from www.handmadenaturals.co.uk . I think that the chemicals put into hand creams and beauty products like perfume, preservatives and silicones etc can actually be counter productive and DRY your hands. Once I started using natural products my hands, face etc are loads better.