If you want to beat the download rush when PC and Mac RTS Starcraft 2 comes out later this month, you can download the sure-to-be-a-huge-hit game from battle.net right now. You won't be able to play it until the official digital release at 10 PST on July 27, though. But you will be secure in the knowledge that your copy of Starcraft 2 is acquired, just sitting there, staring at you, tempting you, waiting. You can even defer paying for the game until after the 27.
Here's the link. Give it a shot and prepare yourself for space-battle-time.
...Unless you prefer cardboard boxes and waiting in line at a game store. Personally, I hate boxes. I lose them, or accidentally light them on fire. They take up shelf space and are a hindrance to my otherwise unencumbered lifestyle. But perhaps you feel differently. The advantage to buying the box is a few extra hours play time, but, on the other hand, if you download you won't be fumbling around with installation discs and whatnot. So, your call. Which are you gonna go with? Box or Download?