Chocolate
A woman always appreciates a box of her favorite chocolates, so if you do
opt for these, get her a flavor you know she likes and would appreciate
(chocolate is said to be a fine substitute for sex for some women, so you
may not want to get her too many). But if they're truffles, my personal
favorite, then get them by the truckload.
Wine
If you know that she has a penchant for fine wine, then get her a bottle
of her favorite stuff. From Amaretto to Zinfandel, there's sure to be
a drink she prefers -- and you can't go wrong with a bottle of french
wine. You can even get drunk together (while you have beer).