I've updated my iOS programming icon/image sizes PDF with the names of the actual files and a few notes regarding the iPad. Unfortunately, with the added notes it is now a two-page PDF. You should find this version of the PDF a lot better though. You can download the PDF from my personal Web site here.
The information regarding the iPad notes I found on this very useful blog posting from Peter Levine. Thanks Peter! You helped clear up a lot of confusion from Apple's own Human Interface Guidelines. :)