First I would call the mothers of the bride and groom to get an idea of what they are needing. Somethings do not get put on the registry list.
You mentioned the couple is young. Dh's niece got married in 2010, they were a young couple only a year out of high school, starting from scratch. They were registered and one of the things on the list was a game for their game system. It was the perfect gift from an Uncle who works in Technology. We bought an extra controller too.
They opened gifts the day after the wedding, you should have seen the groom's face when they opened the box. He was thrilled to get something fun.
Later the bride's Mum commented that they felt uncertain about putting a game on the registry. We figured it gave them a source of inexpensive entertainment.