Roll20 is another online tabletop - recently out of kickstarter - that operates with Google+ Hangouts. It's got good card support, including recently added hands and more features. The changelog has more details, including:
- Better support for multiple decks.
- Switched from the "drag upward" draw motion to just "click" to draw.
- You can now deal cards to players, who have "hands" to hold the cards
- Cards can be dragged and dropped directly from the deck onto the tabletop, or from player hands onto the tabletop, turning them into
drawings that can be moved, resized, etc.
- Cards can be "picked up" from the table to your hand by right-clicking and selecting "Take Card".
- Cards can be flipped by right-clicking and choosing "Flip Card." In addition if you hold down Shift while dropping a card onto the
tabletop it will start face-down instead of face-up.
- Players can re-order the cards in their hands.
- Players can trade cards and steal from each other (there are dialog boxes for confirming both).
- You can now designate that a deck has "infinite cards", then just add one card and it will always be drawn, no need to re-shuffle the
deck.
There is a video overview as well.