Communications in Computer Algebra - The ACM SIGSAM Bulletin. Some tables of contents and sample articles. - http://www.apmaths.uwo.ca/~rcorless/sigsam/
SIGSAM - ACM Special Interest Group in Symbolic and Algebraic Manipulation. Site has details of meetings, reports and other links. - http://www.acm.org/sigsam/
SymbolicNet - Information centre for symbolic mathematical computation. Links to research and software. - http://www.symbolicnet.org/
Computer Algebra Nederland (CAN) - Coordinates the use of computer algebra in education and research. Research reports, newsletters and historical material. - http://www.can.nl/