All the JPEG wrappers that I found on OpenGL examples were compiled for VS6, so that the .lib’s don’t work for VS8.
It’s not that complicated a piece of code. Can’t you just, you know, recompile them under VS2005?
You can link to earlier libs. I’d go with freeimage, it seems easiest to use without dependencies on other GPL subsystems which when I was looking for a PNG loader were a compete pain in the ass being horrendously packaged, mislabeled & generally sloppy for windows development.