UK photo retailer Silverprint reports in their newsletter that Kodak are discontinuing both of their infrared emulsions, the black and white HIE and the false-colour Ektachrome Infrared. Kodak will stop accepting orders from stockists for the films in May 2007, so start hoarding now. (Kodak’s web site doesn’t note the discontinuation, but that isn’t unusual, and I count Silverprint as a reliable source.)
There are other options for black and white infrared, such as Rollei IR820c (formerly Maco IR820c [corrected by Jon below]), Fomapan 400 NIR 730, and Ilford SFX 200 [corrected by George and Jon below], but there are no alternatives to Ektachrome Infrared that I’m aware of.