Although postcard collecting dates back to the 1800's, its popularity remains high today. The process of postcard collecting is formally called Deltiology.
According to Wikipedia, postcard collecting is the 3rd most popular hobby, after stamp and coin-currency collecting. Deltiologists from around the world collect postcards by interest, time period, or other category.
One of the more recent trends involves print on demand (POD) postcards. These products are available online from suppliers such as Zazzle and CafePress. Part of the appeal of POD postcards is that each card is unique, created by an artist that typically produces artwork for one or more niches.
POD postcards tend to be high quality, easy to obtain, and cover a stunning array of niche topics. Their designs are usually available on other products such as t shirts, sweatshirts, hats, notecards, calendars, stickers, mousepads and other items.
Common types of POD postcard designs include photographs, fractal art, special interest logos, line art, digitally created illustrations and other artwork.
The 2011 Christmas holiday shopping season is expected to involve considerable online sales. Online purchases are popular for those that have postcard collectors on their shopping lists.
When brainstorming gift ideas for postcard collectors, it is usually helpful to know what type of postcard the collector specializes in.
For the collector that has enough cards, there is always hobbyist apparel, accessories, gift cards, or other items.