The detailed description of the conceptual basis and development of the interRAI suite was recently published in the BMC Health Services Research journal. The paper was prepared by members of the Instrument and Systems Development (ISD) committee. A companion piece, lead by John Hirdes, which presented the findings of the initial field studies, was also published recently.
See:
Gray LC, Berg K, Fries B, Henrard J, Hirdes JP, Steel K, Morris JN (2009). "Sharing clinical information across care settings: the birth of an integrated assessment system." BMC Health Services Research 9(1): 71.  To view, visit http://www.biomedcentral.com/1472-6963/9/71

Hirdes JP, Ljunggren G, Morris JN, Frijters DHM, Finne-Soveri H, Gray L, Bjorkgren M, Gilgen R (2008). Reliability of the interRAI suite of assessment instruments: A 12-country study of an integrated health information system. BMC Health Services Research 8:277. To view, visit http://www.biomedcentral.com/1472-6963/8/277

interRAI members continue to publish extensively.  Examples of recent publications of general interest are listed below

Berg, K., H. Finne-Soveri, et al. (2009). "Relationship between interRAI HC and the ICF: opportunity for operationalizing the ICF." BMC Health Services Research 9(1): 47.  This paper examines the ability of the interRAI HC to generate data for the International Classification of Function. To view, visit http://www.biomedcentral.com/1472-6963/9/47

Gray, L. and R. Wootton (2008). "Comprehensive geriatric assessment “online”." Australasian Journal on Ageing 27(4): 205-208. This paper describes a novel use of the interRAI Acute Care to conduct assessments over the internet. To view, visit http://www3.interscience.wiley.com/journal/121487175/abstract?CRETRY=1&SRETRY=0