Baccano! would be a good start for getting back in. If you're into the kind of stuff then try Kaiba (still airing). Also, Kaiji is a good watch.
I'll recommend Shugo Chara if you're a fan of magical girl shows, and Soul Eater is watchable if you're willing to watch it for the hot characters and awesome animation/art style rather than an actual story. Both of those are still airing.
Code Geass R2 has started, if you watched the first season. Oh and if you enoy Gundam, Gundam 00 season 1 aired while you were gone and the second season starts October this year.
Otherwise, just watch anime as you were before you left. >>12591163
Yeah, I was about to say that you should watch that if you missed the end of it, but if that's when you left then what I've said above should suffice.