
1. Postcards —
Postcards were born in the UK, in the Victorian era, and allowed vividly colored images to be sent and received for the first time. Some souvenir wholesalers now claim sales are half of what they've been in recent years.

2. Slide shows —
There's Mom cooking dinner outside the tent. Click. There's cousin Hannah setting the split-log picnic table. Holiday slide shows were once the cultural after-dinner mint of the suburban dinner party. The rise of camera phones and online photo-sharing is putting an end to that.

3. Guidebooks —
The demise of the unwieldy travel tome won't be mourned by those who feel they create homogeneity by guiding users to the same hotels/restaurants/sights. Yet filled with potted political history, culinary glossaries, maps and descriptions, few things whet the appetite for a trip like a guidebook. We'll miss that.