Oh my, finally a thread were I can promote my current obsession? Great! ...it is the choice of the Steins;Gate after all...
I'm pretty tired right now, so I'll keep it short. Steins;gate is about a group of friends who have, during their wacky experiments they do for fun, accidently converted their microwave into a device that can send text messages into the past. Trying to discover the potential of the device, Okabe Rintarou uses it numeral times. But messing with time is tricky business, and Okabe learns that the hard way...
I'll tell you now, you have to take the science used to back up the plot with a grain of salt, because after some thought it comes down to a sort of fridge logic. Also, the main character needs to grow on you a bit. But seriously, you will be able to relate to him over time.
Damn. I thought I would keep this short... Oh well. I'll just say Steins;Gate works as a time travel story, so to speak. It has rich, likable characters, an interesting plot, and some severe psychological terror. To me it shot up to the caliber of Bakemonogatari and the like.
Currently my fave anime, and I have seen more than a few, so I guess that says something.