I found this at www.usabride.com
The grooms cake is suppose to be a gift from the bride to the groom. In ancient times, it was believed that if a single woman put a piece of the grooms cake under her pillow, she would dream that night of the man she would marry.
This cake is usually dark, liquor-soaked, CHOCOLATE, or deep chocolate fudge. The cake would be displayed next to the wedding cake and later cut up and put in small white boxes for the guests to bring home.
Sometimes the grooms cake is served at the reception as an alternative or SECOND DESSERT choice. Until recently, many couples had chosen to forego the groom's cake, as an unnecessary expense.
However, the grooms cake has made a recent comeback. It has shown up as dessert at the rehearsal dinner or a "late night snack" to be enjoyed with the wedding party. It makes for a great surprise, a few laughs and who can resist a deep, double chocolate fudge cake?
Many are getting creative with the grooms cake and making it in various shapes and styles to match the grooms personality or a particular interest or hobby. How about a cake in the shape of a golf club, computer, boat, or a slot machine, just to name a few
I also posted this earlier but thought it would be good to repost it.