I also used to do a lot of infrared photography - you can see my webpage on this topic with links:
http://home.primus.ca/~rachelita/rachelita.htm
i used the Oly2100UZ (a 2.1 MP camera) and the Hoya R72 filter - do not spend more than 5 minutes on editing images - you can see my gallery here:
http://home.primus.ca/~infrared/
Also concerning about article, I have to disagree about the best times to do infrared or perhaps it depends where you live - in Canada, the best is the spring and the summer, in very high sunny days - the winter light is way too low and diffused and soft and no infrared are emitted and thus do not pass through the very opaque filter.