Jewelry is always a good standby, but EVERY man gives women jewelry. Giving a good gift is not hard. It just takes some insight into the person. Does she want you to ever do something with her that you don't? You'd be amazed at how working that into the gift can make it much better to her.
Like Ben Dover did, taker her clothes shopping and help pick out clothes for her. Most women LOVE this, and you actually get to help pick out what she wears. Women lovet his kind of attention, and you get brownie points.
Stuff from Victoria's Secret is ok, but I find it's always best to get a gift certificate or to let her pick it out. If you get her something a size too big, she's going to think you think she's fat, regardless of her size. If you get it too small, she's not going to wear it and it's pointless. The gift certificate way works best, since she gets to pick it out and surprise you with it later.
Is she the romantic type? Rose petals leading to a nice candle lit dinner with some soft music (THE ONLY THING KENNY G. IS GOOD FOR! [}:D]), then another trail to the bedroom with a NICE terrycloth robe and invitation to a warm bath where you massage her feet or wash her hair will do wonders for her, and get you some touchy feely time afterwards.
Remember, it's not how much you spend, it's how much you thought about it sometimes. Unless it's jewelry, then it IS how much you spend! [:D]
God Bless Texas