The Mac using scientists amongst you are probably aware of the 
program Papers for organising your electronic library of articles. The developer, Alex Griekspoor (aka mek), has been working hard on the corresponding iPhone version lately; now, it has been submitted to the App Store and is expected soon. Update 19.2.2009: available now. Not cheap with 10 Euros 8 Euros (Update 27.2.2009: sorry, my mistake, was 10 Dollars. And actually, it is rather cheap, considering what other things I buy for 8 Euros;-), and the iPhone seems also a bit small for reading papers, but might nevertheless be a useful tool. Also, it includes a free online backup via Amazon S3 (!) and syncing to the coming Papers (for Mac) version 1.9.
Personally, I like the Mac version of Papers a lot: it is really an innovative program, although for me it has never been very stable (this, however, seems not to be a common problem according to the forums. Still, apologies to mek for never mentioning my instabilities to him ;-).
Update 27.2.2009 P.S. After I posted this, I wrote the Papers developer, mek, about my instability problem, and he answered within a few hours. It is a known issue having to do with Smart Lists. Now, my Papers version is responsive and stable!
Notes on Disordered Matter 
Does Papers do anything that Endnote does’nt do? Regardless anything that makes an iphone part of my work brings it one step closer to me getting one from budget expenses.Hooray.