This was all prompted by seeing that I'll be able to download a kindle app for the phone I'm going to buy (about which I am WAY TOO EXCITED). A friend has the regular Desire and I was fiddling around and liked the look of the ebook reader she had installed so I may or may not use the kindle app - it depends largely on whether I can scroll using the volume buttons on the side (something FBreader does allow) as that allows me to read one handed and without having to move my fingers to turn the page, something it took me a while to find for my current phone (why are there so few good apps for the N97, eh?).
In the end though, I just don't like DRM'd stuff - I've been through too many format changes for it to feel safe. I'll likely buy eBooks from Amazon while I can unlock them, but the unlock already needs an old version of Kindle for the PC. As soon as Amazon lock that version out from downloading, I'll have to go back to just bittorrenting things. Or wait for the market to finally give up on DRM, like the music market did, I suppose.