Some good Theoretical Computer Science Journals
Apart from top conferences mentioned by @usul, I think Journal of the ACM (JACM) is a top journal in computer science, which also includes many excellent theoretical computer science papers. In addition, I read some papers published in Algorithmica. Also, just giving a reference, I find a link to some journals related to Discrete Mathematics (particularly refer to Theoretical Computer Science and Algorithms part), see http://www.math.iit.edu/~kaul/Journals.html.