I have the SRD from TheRaven and stephenh from
http://www.systemreferencedocuments.org/ on my iLiad in HTML.
It works pretty well with the iLiad HTML viewer since a lot of the stuff is hyperlinked.
Unfortunately the creators did not process every part of the SRD, so some large HTML files remain and those are a pain to read on the iLiad.
I haven't really tried any of the other SRD's on that site, they might work better.
Anyways, I'm not sure of the use of the iLiad at the gaming table. It's an expensive device and I don't feel very comfortable putting it between the drinks and other foodstuffs.
Since it is a lot easier to carry than all my gaming books though, I usually have it with me in case I want to look something up, but I leave it in my bag otherwise.
As far as character sheets go, for our D&D campaign we put up a small wiki with PDF export possibilities, so I simply have a little wget script that updates the PDFs on my iLiad.
This is mainly as a backup though, since I find that the pen&paper variants work a bit easier.