1. One spacecraft at Saturn (Cassini)
2. One spacecraft en route to Jupiter (Juno)
3. One spacecraft at Mercury (MESSENGER)
4. One spacecraft at Vesta (Dawn)
5. One spacecraft on its way to freaking Pluto (New Horizons)
6. Three missions [I think] still in operation at Mars (Odyssey, Mars Reconnaissance Orbiter and Opportunity) with a fourth on its way.
7. A few other comet/asteroid missions I've lost track of, plus
8. A bunch of other stuff, with the big highlights being Hubble and Kepler.
NASA's "already puny" budget is three times that of the ESA and easily exceeds the rest of the world put together, so one really can't complain too much.
That's not to pooh-pooh the ESA, by any means, they're doing some good stuff. But they have a long, long way to go before they catch up with NASA.
This will be the first non-American mission to the outer solar system, incidentally. NASA so far have sent eight. (Two Pioneers, two Voyagers, Galileo, Cassini, New Horizons, Juno.) All but Galileo are still in operation.