'Does anyone think the royal wedding is a target.' - It's already a target. A target for every 'Royal Watcher', Brownose, 'Fashion Expert' and 'Kate Middleton needs to...' advisor that has crawled out of the woodwork and got their stupid faces on the Tele - and it won't stop until long after the wedding, so get used to it, there's lots of mileage to be got out of it yet.
If there's a terrorist attack on 29/4/11, it won't be anywhere near the Royal Wedding; AQ or RIRA will not waste their time trying to hit a heavily defended target when there are so many other soft targets to choose from. 7/7 Proved that. And a bombing on the same day as the Royal Wedding has tremendous publicity value, even it takes place a hundred miles away from the bride and groom.
Kate and William are perfectly safe. It's the rest of us that should be worried.