I have a Jetbook Lite which is very similar to the Jetbook, so I can only speak for it. In fact I've had it for less than a week, but I'll answer your questions as best I can.
*dictionary lookup - Yes (Multiple languages)
* highlighting - No
* annotating - No
* adding your own bookmarks - Yes
* seeing how many pages/screens are in the current chapter - No
* setting margin widths - No
* toggling justification on/off (mercifully, default is off) - Yes
As for DRM support, the Jetbook Lite is in its infancy. It does support DRM from several PDB sources but not yet epub. The support is not complete as the DRMed books don't display properly with text missing at the bottom of the page. Ectaco is working very hard to fix this and release firmware updates on a regular basis. In fact three different versions have come out in the last week. Non DRMed books display very well without the punctuation quirk you mentioned. I've only used txt and epub files that I've imported with Calibre so I don't know about the other formats. Also, as you probably know, the Jetbook does not use e-ink technology. It uses a high resolution LCD display which, in my opinion, having used a Kingle, is every bit as good if not better.
As for the supported features of the reading devices you already have, the Jetbook Lite has them all with the exception of hyperlinking. The Jetbook also supports multiple levels of folders.
I think that the Jetbook Lite is a fantastic device, expecially considering that it can be had for as little as $100 at a couple of the ebook stores online. I've owned a Kindle and a Sony Reader and would not return to them.
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