BD links
BD BioSciences has a number of ELISPOT-related links, such as:

• ELISPOT reagents and instrumentation, listed on their Canada site
• A BD Pharmingen page, which has a description of the ELISPOT process
• Another BD Pharmingen page, discussion ELISPOT instrumentation and software
• Another description of the ELISPOT process, this time on their USA site
• Something from an old newsletter
• Miscellaneous BD kits and devices, including data management tools, flow cytometry apparatus, cytokine detection kits and a whole slew of assay tools
• An older page featuring an early ELISPOT analyzer.

They also have a whole bunch of PDFs and more general immune function information, but these links should be adequate starting points for locating those.