ebooks.com accepted my Kindle PID so I assume that I'll be able to download and read my DRMed MobiPocket books I purchased there. Haven't tried it yet but I will when I get some extra time.
@GatorDeb - If you want to fix the titles use
mobiperl Tompe made windows executables (I'm assuming you're using a windows computer) and mobi2mobi would allow you to add the title and author to the .AZW files. I had to do that because I had way too many DRMed MobiPocket books so I need to see the title.