Sure, a bottle of wine makes a great gift to bring to a party.
However, if you're looking for another way to say thank you to your host or hostess, Limor Suss from trendgirl.com has a few ideas.
Teavana White Chocolate Peppermint Mint Tea Leaves & Tea Diffuser Mugs
You can never go wrong with a box of Godiva.
Sugarfina - 3 piece bento box
Votre Vu Hand Cream/Lip Gloss Duo - $18, 4 for $44, VotreVu.com
For the home:
Lenox Cheese Board
Ampersand Wine Rack/ Bar Caddy
Star and Arrow LED Marquee Lights
Slate Place Card Set