1.  Math and CS print journal subscriptions. (Some of these journals have electronic access as well.):
        Acta Arithmetica
        American Mathematical Monthly
        Chance
        Comap (Consortium for Mathematics & its Applications)
        Umap Journal
        Duke mathematical journal
        IEEE Spectrum
        Journal of algebraic combinatorics
        Journal of symbolic logic
        Journal of Undergraduate mathematics
        Mathematical intelligencer
        Discrete mathematics
        International journal of game theory
        Journal of nonlinear science
        ACM computing surveys
        Communications of the ACM
        Journal of the ACM
        SIAM Journal on Computing
 

2.  Math and CS electronic subscriptions.  (Links to these electronic subscriptions can be found below or in the library's comprehensive listing of all electronic resources for mathematics and for computer science.)

Academic Press IDEAL (includes access to all journals published by Academic Press from 1996 to
date (and sometimes access to pre-1996):
        Advances in applied mathematics
        Advances in mathematics
        Computer Speech and language
        Computer vision and image understanding
        Digital signal processing
        Finite fields and their application
        Graphical models and image processing
        Historia mathematica
        Information and computation
        International journal of humn-computer studies
        Journal of algebra
        Journal of algorithms
        Journal of approximation theory
        J. of combinatorial theory, series A, B
        J. of complexity
        J. of computer and systems sciences
        J. of differential equations
        J. of functional analysis
        J. of mathematical analysis and applications
        J. of multivariate analysis
        J. of network and computer applications
        J. of number theory
        J. of parallel and distributed computing
        J. of symbolic computation
        Optical fiber technology
        Real time imaging
(Any journal published by Academic Press is available through IDEAL.  These journals are individually listed in our catalog or may be accessed through IDEAL on the library's website.)

PROJECT MUSE  (Journals published by Johns Hopkins Univ. Press and some addition university presses.):
        American J. of Mathematics

Elsevier's SCIENCE DIRECT  (A consortium of NJ libraries has access to almost 400 unique titles.)
        Applied mathematical letters
        Artificial intelligence
        Computational Geometry
        Computer-aided geometric design
        Computer networks
        Computer aided design
        Computers and operations research
        Discrete mathematics
        European J. of operational research
        Expert systems with applications
        Finite elements in analysis and design
        Information processing and management
        Information processing letters
        Information systems
        Internaitonal J. of Information management
        J. of operations management
        Knowledge-based systems
        Statistics & Probability letters

3.  Back issues of many journals are also available through  JSTOR.  The journals (and dates available) that you can find there are listed below.  (Sorry...I didn't see any CS titles.)
Mathematics:
          American Journal of Mathematics 1878-1995
          American Mathematical Monthly 1894-1994
          Annals of Mathematics 1884-1994
          Journal of Symbolic Logic 1936-1995
          Journal of the American Mathematical Society 1988-1994
          Mathematics of Computation 1960-1994
           Mathematical Tables and Other Aids to Computation 1943-1959
          Proceedings of the American Mathematical Society 1950-1994
          SIAM Journal on Applied Mathematics 1966-1994
          Journal of the Society for Industrial and Applied Mathematics 1953-1965
          SIAM Journal on Numerical Analysis 1966-1994
          Journal of the Society for Industrial and Applied Mathematics: Series B, Numerical
               Analysis 1964-1965
          SIAM Review 1959-1994
          Transactions of the American Mathematical Society 1900-1994
Statistics:
          Annals of Applied Probability 1991-1994
          Annals of Mathematical Statistics 1930-1972
          Annals of Probability 1973-1994
          Annals of Statistics 1973-1994
          Applied Statistics 1952-1995
          Biometrika 1901-1994
          Journal of the American Statistical Association 1922-1994
          Quarterly Publication of the American Statistical Association 1920-1921
          Publications of the American Statistical Association 1888-1919
          Journal of the Royal Statistical Society. Series A (Statistics in Society) 1988-1995
          Journal of the Statistical Society of London 1838-1886
          Journal of the Royal Statistical Society 1887-1947
          Journal of the Royal Statistical Society. Series A (General) 1948-1987
          Journal of the Royal Statistical Society. Series B (Methodological) 1948-1995
               Supplement to the Journal of the Royal Statistical Society 1934-1947
          Statistical Science 1986-1994
          Statistician 1962-1995
          Incorporated Statistician 1950-1961

4)  To find Math Reviews abstracts and other information about articles in Mathematics, check out the searchable database MathSciNet.  A potentially similar site for the CS folks is the ResearchIndex site;  in this searchable database you can find abstracts, related information, and frequently links to an entire article.