ExpressCard has replaced the PCMCIA card cage in the PowerBook G4. The ExpressCard standard supports two sizes cards, 34mm and 54mm width. MacBook Pro supports the 34mm standard.
Unlike the previous PCMCIA design, there is no eject button. The card itself is used to engage and disengaged itself from the card cage. In some designs like Ethernet ExpressCard, the card sticks out beyond the card cage. It is easy to push on the card to release it. Other cards will be flush with the MacBook Pro enclosure and will take a little more care to pop out.
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