Several of these articles were originally posted on my blog or written as educational pages for the ECIR group.
Some of these pages are in PDF format which requires Adobe Reader to open. You can download Adobe Reader here.
(Mac users can open PDFs with Preview.)
There are additional PDF articles below which I haven't converted to a web page yet. Clicking on the file title will display the file in Google Docs, or you can download the pdf (use the ⬇).