I am rated 1845. Was rated 1539 half a year ago.
At this level 1845, what is important to study?
What is important to learn?
Looking forward to the debate?
Just keep using tactics trainer and chess mentor. Here are some books I'd recommend and that I am using atm if you want to study books:
Game collection: http://www.amazon.com/Mammoth-Worlds-Greatest-Chess-Games/dp/0762439955/ref=sr_1_3?s=books&ie=UTF8&qid=1343255951&sr=1-3&keywords=The+mammoth+book+of+chess
Cool. Thanks a lot. :-)
At this level improvement becomes more difficult. You may want to try coaching, with someone rated 2200+ to help you.