I am on the editorial board of Information Retrieval, a Kluwer journal.
I also serve as the ACL Anthology Editor, as of 2008. We run a local mirror of the ACL Anthology within NUS, updated weekly. The local mirror may only be available within NUS.
I am editing special issues of the IJDL (on very large digital libraries) and the IJCLCLP on Chinese language question answering.
I am serving as the registration chair for SIGIR 2008 and am serving as publicity chair and helping out in the local organization for ACL-IJCNLP 2009. I have also served as the publication chair of AIRS 2006.
I am an active member of the community, serving as a reviewer and program committee for a number of conferences in my active research areas. In digital libraries, I have reviewed for JCDL ('08, '07, '06 and '05) and ICADL ('07 and '03). In computational linguistics, I am serving as area chair for information extraction in ACL '08. I have reviewed for ACL ('05 and '03), EACL ('08), EMNLP ('08, '07, '06, '05), HLT-NAACL ('07 and '06), RANLP ('07 and '05), COLING '04, INLG '04 and IJCNLP '04. I have also reviewed as a specialist in human-computer interaction - IUI ('07 and '06), multimedia - CIVR '06 and in general AI conferences (in the computational linguistics track) - IJCAI ('07 and '05).
I have also served as a reviewer for a number of specific workshops including AIRS ('06 and '05) and WIDM ('05, '04 and '03), MMIES ('08, '07 and '06).
I have also been a one-off reviewer for a few other journals, such as Information Processing and Management (IPM), Data and Knowledge Engineering (DKE), and the International Journal of Information Technology (IJIT).
I do a small amount of consulting work for industry as well. I've acted as an external examiner for grant proposals in Malaysia and Hong Kong. I am also a board member (and previously, an auditor) for the Singapore chapter of the Int'l Assoc. for Pattern Recognition (PREMIA).