Hellsing and Hellsing Ultimate: The first series is only 13 episodes and I watched it all in 2 days. Hellsing Ultimate is a 10 part OVA (only 9 have been released so far, and only 8 dubbed) that follows the manga more closely than the original series (according to my friend, it's similar to FMA/FMA:Brotherhood). The best part, IMO, about Ultimate is that the episodes are 45 minutes to an hour long. AMAZING series, really looking forward to the rest of it.
Golgo 13 : Only got to watch the first 13 or so episodes since that's all that was on Netflix, but from what I saw it was really good. I watched this in June or July, and I'm STILL looking for the rest of it
High School DxD: Boobs, demons, chess and more boobs. And boobs.
Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne: Currently watching this. I really can't describe it though, it's just so weird. If you're looking for something to watch, and are open minded when it comes it anime, give it a go.
Other recommendations would be Burst Angel, Murder Princess, el cazador de la bruja and Black Lagoon.
Seriously, if you haven't watched Black Lagoon, watch it. It's fucking amazing, my favorite anime BY FAR.
At the moment I'm currently switching between Soul Eater and Deadman Wonderland.