As mentioned by Sparky, a setup with a proper solar filter will work. However, you'll essentially get a white circle with a black dot on it. Probably more interesting (but more expensive) is the use of a solar telescope like the Coronado line (Coronado Telescopes), which uses optical interference filters to extract a very narrow wavelength of light (hydrogen-alpha). These will show texture and prominences and all kind of interesting detail on the sun. I believe that some groups are planning to capture the event live and broadcast over the internet. Will have to check with a friend who belongs to an astronomical club.
You don't want to miss this one on June 6th, because after it, the next one won't occur until December of 2117, 105 years from the June 6th, 2012 transit.