mobi or kindle file for beta readers

That's what I plan on doing for a couple of my beta readers, so they can see how the book "reads" on their kindles. I'll use a program someone mentioned in my self-publishing thread to render it into a mobi file and use the usb port to shoot it into their kindles (will try it on mine first, of course...lol.)

I write in Word and send my betas a pdf file they can print out and scribble comments and corrections on in red. When they're finished, I get the manuscript back with their suggestions and comments on it.

I usually give people doc or rtf files, but if asked, I'll give someone an epub or mobi. I often make epubs of my drafts to read on my e-reader anyway. Very fast and easy to do in Calibre. It's not like I make a cover or anything.

A MOBI is a kindle file, you can side load them onto kindles.

I send betas doc or rft, so they can easily add comments. When I'm betaing someone's work, I have no interest in how the book will look on my ereader. It's all about the words at that point, not the presentation.

Later on, you might want people to proofread the final ebook files, but that's some steps further on in the process. If I was doing that, I'd convert it in Calibre and send that version.

I usually send the doc or PDF file.

I think it's a matter of preference for the beta reader. I send docs to my beta reader but sometimes when I beta for her I have her send the mobi so I can read it in my kindle app on my iPad.

I send it as a .doc or .rtf file. That way the beta can use the track changes feature on word (so I can see what their suggested edits are) and/or leave comments.

I sent the Word doc or a PDF to my betas. I didn't know how to convert it to the other formats, plus it made it easier for them to leave the feedback in the document.