Has anyone else ever read a book, only to find a mistake in wording and you want to contact the editor and say wth? As far as beta reading, I would enjoy doing that, but I'm not great with pronunciation, and would I just post it here?
Not quite sure what you're asking here. Do you mean you'd like to beta read for someone? If so, you can list your name in the Willing Beta Readers thread. However, beta reading is much more than catching typos and grammar errors, and it's generally private correspondence between the author and the beta, rather than something you'd post on a public forum.
On the other hand, if you want to try your hand at critting someone's work, look on the password-protected Share Your Work forum. (Password is "vista.") Do be sure to read the stickies before posting.