I'm just installing bluefire now on my iPhone4, will try on my iPad when I get home. From the ZDnet review and this thread it looks to be able to be the app that will allow me to NOT use 18 different readers, thank goodness.
For me it will be "just right" if you will support cbr/cbz comic files. Currently I'm using Stanza on the iPad, but it's really clunky to load the books onto the iPad and into Stanza.
Is this already on your to-do list? If not, please do so.