Here's what I can recommend:
Trigun - Basically a "western" that is set up in deep future on a mostly desert planet.
Kenran Butousai - This one is kinda like an underwater version of Gundam if I remember correctly.
If you like gorefest with zombies on top of it, you can take a look at these titles:
Hellsing OVA series (mainly vampires, but zombies are also largely present)
Highschool of the Dead (Zombie Apocalypse)
Maybe "Berserk" too, but I haven't watch it myself yet, so I can't say anything about it. I heard it's awesome though.
if you're seeking for something cute, I'd recommend Lucky Star or K-On.
Welcome to NHK - This anime is about a hikkikomori and how he tries to fix his life and get back to society.
Interstella 5555 - A feature-length anime based on "Discovery" album by Daft Punk. It's a story about an alien pop band that was kidnapped by an earthling.
And that's what I can mention right off the bat...