But rumors were rumors, and Apple had something up its sleeve, so I waited out for the iPad announcement, and bought it right away when it was released. Can't beat the speed and in my case color since I work in a biology lab, so that pictures in articles often are in color.
I now use Papers2 from Mekentosj.com on both the Mac and iPad, and it is *awesome*. Papers2 on the iPad lets you search the PDF for content, metadata (Authors, abstracts, journal, year, etc.) but also let you search major databases directly. It then synchronizes with Papers2 on the Mac, which works basically like iTunes for your scientific articles. And you'd be surprised how effective that can be.
Check it out, it is awesome. In my lab three more people have now bought an iPad with Papers2 due to how efficiently it works, and one even switched to Mac, heh. Papers2 still have some glaring bugs, due to a ground up rewrite from Papers 1, but the devs are very responsive and helpful.
Phew, what a sales speech!