Earning enough coins to buy a boost require playing multiple rounds of the game. While you play, coin-bearing gems (they're imprinted with a number) will drop into the playing area, and to collect the coins, you'll have to match the gem with at least two other gems of the same color. You can also earn additional coins depending on how many multipliers are collected during a game.
When you have enough coins, it's time to go on boost spending spree. Currently, there are five types of boosts to choose from, such as one that lets you add five seconds to the game to another that blows up all of the special gems on the board. Once purchased, boosts will last for three games each, then you'll have to purchase them again. You can also use multiple boosts at the same time, which results in some rather spectacular explosions. Below is a list of boosts and how they affect the game.
Puts a random special gem on the board in the beginning of the game
Detonates all special gems on the board
Scrambles all gems on the board
Puts a multiplier on the board at the beginning of the game
Adds five seconds to the game
Right now, Bejeweled Blitz coins and boosts are in a testing phase, and Pop Cap is asking players for feedback on these new additions. So far, this seems like a great way to add something new and exciting to a game that can you turn you from a normal person to an obsessive fanboy in a matter of 60 seconds.