For action Black Lagoon is pretty much essential viewing. Mercenaries in an exotic locale, pretty much non stop gunfights and chases, and some hilarious dialogue ( laughed my ass off at some of the lines)
The new series in the GUNDAM franchise, Gundam 00 is a must see, awesomely awesome indeed. If you're new to the whole gundam scene, its still easily enjoyable as its not related to any other series really.
Ouran High School Host club is decent, quite funny and very light viewing, not too heavy with the angst (thankfully)
Samurai Champloo is one of the slicker Samurai/Ancient Japan setting anime shows out there, doesn't take itself too seriously and has some really fantastic fight sequences, snappy dialogue and a great soundtrack that has hip hop overtones mixed in with traditional music and a variety of other genres.
Full Metal Panic is a favourite of mine, funny and full of action, gotta watch it.
Hellsing is possibly THE best vampire anime around, so damn cool, you NEED to see it!
Hope this little list is helpful to ya.