Get things off on the right foot with a small present. It shows that you've thought in advance about your hosts and are aware of the generosity that their invitation implies.

Wine, flowers or candy are fine if you're just staying for dinner, but consider something more substantial if you're staying for a weekend or longer. Classic housewarming gifts include houseplants, jams, tea and coffee, and stationery--things that will last beyond your stay. If you make a dish that your host particularly likes, you can also consider bringing this instead.