Every day new models are being launched with a lot of exciting features.
You can choose whichever you think will be liked best by her and which goes a little easy on your pocket too. A Polaroid image developer and printer would be a great gift too. She will get the instant handouts of the pictures she clicks. It is a cool gadget to carry about and will get you the best snapshots of anything, she would want to capture.
You could also give her USB drives of unique shapes and sizes. A heart shaped USB drive would prove to be an excellent gift. This will be the perfect romantic gift that provides utility as well by storing images and songs the both of you like.
A frequent traveler would love to possess a noise isolating headphone or headset. So, if your wife has a job which requires her to travel a lot, the best thing you can get for her is such a gift. A thoughtful gift like that will surely give her immense pleasure.
Again, if your wife has a love of reading, you could give her a Portable Reading Device. It is a wireless medium which allows one to download books, magazines and newspapers. Its high resolution screen makes reading a wonderful experience. Reading from a portable reading device is just like reading from a real paper and counts as a great gadget gift for wife.