I've currently got a Nokia 770 - I love it's HTML support! I'm using an Opera variant to read there. I'll be getting an N810 as soon as I have the money squirreled away - with luck, that'll be the end of January. Watch for me to squee then - I'll certainly be talking about how it's going for me! I do need to come up with a calendar/addressbook app for it - there are options available already. Reports are the N810 uses a Mozilla-based browser - it can handle just about any HTML.

From what I've read, the Cybook's HTML handles single-file HTML reasonably well - the two specific tests I know it's been put to are samples from Project Gutenberg and Baen e-books in single file mode. It will not (currently) handle the multiple files of a standard Baen e-book multi-file format. Check out naebllc.com and/or bar.baen.com, the "EBook Reader" conference, for more info on the Cybook.