PFT reports the Vikings plan on selecting safety LaRon Landry.
I have mixed feelings. There are some impact safeties in the league (Troy Polamalu and Ed Reed are the best playmakers, and Brian Dawkins is probably the best cover-2 safety), but if you're picking a safety at #7, you better believe he's going to have that sort of dominating impact. If Landry is that dominant, great. If he's merely a good safety...well, if he's the best player available, so be it.
According to Ted Kluck, safety is the safest position to take, with a high percentage of Pro Bowlers and a low percentage of busts. If the Vikes get Landry, it won't be terribly exciting, but it might end up being the best choice.