Luggage and bags:
We were lucky enough to have a hire car so we didn't need to worry too much about bags at that point... But I would still recommend a day pack to take on your daily trips and a good backpack for easy carrying.
Clothing/Shoes/Weather Gear: Good walking shoes are a must - and so is good wet weather gear...
Photo Equipment: Lots of film for those piles of photos you will take... :) I wish I had a lot more film but we had to limit ourselves with 10 weeks in Europe.