Practical Geostatistics 1979 by Isobel Clark. Massive work put online by the authors. See http://www.kriging.com/
The tutorial written by William L. Wingle and Eileen P. Poeter (Colorado School of Mines, Department of Geology and Geological Engineering Golden, Colorado) is well made but, unfortunately, limited to variography. See http://www.uncert.com/tutor/
The online lecture Quantitative population ecology by Alexei Sharov (Department of Entomology, Virginia Tech, Blacksburg, VA) is certainly worth a look.
GIS & GEOSPATIAL ANALYSIS
Geospatial Analysis - a comprehensive guide, by Michael J. de Smith, Mike Goodchild, Paul Longley, is available from www.spatialanalysisonline.com/output/. This guide addresses the full spectrum of spatial analysis and associated modelling techniques that are provided within currently available and widely used Geographic Information Systems (GIS) and associated software. [NEW]