If live updates are essential, then only the Kindle and the iLiad are candidates.
The Kindle will only work if the conference is in the US and at a location that is in range of Sprint EVDO. The updates could be via e-mail to Amazon for re-sending via Whispernet, or via clicking on a pre-built link in a MOBI ebook.
The iLiad has WiFi, but you may need some serious Linux expertise on hand (before and during the conference) to get the iLiads working smoothly in this environment. An advantage of the iLiad is that you can add custom applications.
Both the Kindle and the iLiad allow notes, the Kindle by typing on its (tiny) keyboard and the iLiad via a stylus.
On the Kindle the documents have to be MOBI (AZW) ebooks, but can have been converted from several document types. On the iLiad, PDFs formatted for the screen size would be best.
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