Journals to publish in (with year started and with impact factors (1999) from http://www.bioreference.net/impact/ where available)

Journal of Web Semantics (Elsevier, 2003) IF: 3.4
Journal of the American Medical Informatics Association IF: 3.094
Data Mining and Knowledge Discovery (Springer, 2002) IF: 2.420
Information Sciences: Informatics and Computer Science Intelligent Systems Applications (Elsevier, 1968) IF: 2.147
Computational Intelligence (Blackwell, 1985) IF: 1.972
ACM Transactions on Information Systems (ACM, est. 1983) IF: 1.969
IEEE Trans. on Knowledge and Data Engineering (est. 1989) IF: 1.896
Applied Soft Computing (Elsevier, 2001) IF: 1.537
Information Processing and Management (Elsevier, est. 1963) IF: 1.500
Data and Knowledge Engineering (Elsevier, est. 1985) IF: 1.144
Knowledge and Information Systems (Springer, est. 1999) IF: 0.844
Journal of Intelligent Information Systems: Integrating Artificial Intelligence and Database Technologies (Kluwer, est. 1993) IF: 0.796
Information Retrieval (Kluwer, est. 1998) IF: 0.770
Applied Intelligence: The Int. Journal of Artificial Intelligence, Neural Networks, and Complex Problem-Solving Technologies (Kluwer, est. 1997) IF: 0.500
Intelligent Data Analysis: An international journal (IOS Press, est.2000) IF: 0.446
World Wide Web (Kluwer, est. 1998) IF: 0.300

Web Intelligence and Agent Systems An International Journal (The Web Intelligence Consortium - IOS Press - est. 2003)
International Journal of Information Technology and Decision Making (IJITDM) (World Scientific - est. 2002)
ACM Transactions on Internet Technology (ACM, est. 2001)
Information Systems Journal (Blackwell, est. 1990) (1.608?)
Int. Journal on Digital Libraries (Springer, est. 1997)
Autonomous Agents and Multi-Agent Systems (Kluwer, est. 1998)
Web Semantics: Science, Services and Agents on the World Wide Web (Elsevier, est. 2003)
Applied Ontology (IOS Press, 2005-11)
http://www.sciencedirect.com/
Natural Language Engineering (Cambridge Univ. Press)
Int. Journal of Knowledge Management (IDEA Group Inc. 2005)
International Journal of Information Technology and Web Engineering (IDEA Group Inc. 2006)
Terminology (John Benjamins, 1994)
Journal of Digital Information Management (Digital Information Research Foundation, 2003)
International Journal of Semantic Web and Information Systems (Idea Group Inc, 2005-01)
International Journal of Web Information systems (2005)
Journal of Web Engineering (Rinton Press, USA, 2002)
ACM Transactions on the Web (ACM, 2006)
ACM Transactions on Knowledge Discovery from Data (ACM, 2007) submission
Transactions on Machine Learning and Data Mining (2008)
-----
Health Informatics Journal (Sage)
International Journal of Agricultural and Environmental Information Systems, IJAEIS

VISUALIZATION JOURNALS
Computer Graphics Forum
Information Visualization (Sage)
Journal of Visualization (Springer)
IEEE TVCG
IEEE CG & A

Conferences:
International World Wide Web Conference 2003 2002 2001 2000 1999
VLDB
SIGIR
KDD
IJCAI AAAI