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Header Advertisements are 728 x 90 traditionally and are at the very top of the page, so it is the first thing a visitor sees, without being pestered with a pop-up.
Standard Advertisements are 250 x 250 are fully animated and show (6) 10 second advertisements in rotation. It's a proven attention getter, and you are only charged once per viewer.
Whole Block - Some people just don't like to share, and that's Awesome! If your concept requires your own space - you can purchase all 6 spaces for the price of 5, and still get a better deal than you can elsewhere.