BookZ
The BookZ text reader for iPhone (web | iTunes) is simple: you can download text (.txt) files from the web and read them on your iPhone.
The interface is clean and responsive, and the preferences are accessible, and easy to use. Ease of use isn’t always at the top of the list in iPhone applications, and BookZ stands out with two preference screens:
First off, font sizes are displayed actual size, so there’s no guessing. Seems simple, but lots of applications get this wrong. I don’t want to have to guess — just show me the font size!
The font faces are also shown using the font face itself, so there’s no question about what “Zapfino” really means.
Manybooks.net doesn’t currently offer plain text files (various reasons, none of which are really top of my list right now), but most titles have links back to Project Gutenberg in the download menu. If you’re browsing this site with BookZ’s built in web browser just select “Project Gutenberg” from the dropdown and you’ll be sent directly to the page for that title. Click on the plain text link and you’ll be reading in no time!