iChm for Mac, iPhone/iPod Touch
[for Mac:
* Fully built with Cocoa. No ugly window and slow rendering.
* Tab browsing
* Search. Result sorted by relevance.
* Text encoding detecting/switching
* Find in the page
* Tag powered bookmark
* Index
* Back/Forward
* Text zoom
* Export to PDF
* Continuous reading with Page down/Page up
[for iPhone:
* upload/delete CHM files to your iPhone/iPod touch with web browser.
* view CHM files with ease
* fit-to-width mode for non-fixed-width page.
* full screen mode
* view in landscape mode.
* navigate through Table of Content or search
* font size manipulation