For some reason (that I can't remember though i think it had something to do with SE's 301 problems) a few years ago I used frames to show my website:
on the various mispellings and tlds:
e.g. www.exxample.com www.ex-ample.com www.example.co.uk
but now if you type the domain exxample.com into Google it ranks my actual domain www.example.com at No.1 and exxample.com is not showing in the results anywhere. Have 100% framed pages become the same as a 301 redirect?
I only did this with the one domain so don't have anything else to test if that is the reason.
Google has varied the way they handle framed pages over the years. It boils down to one of two methods: (1) they show the framed page, warts and all, (2) they link to the <frameset> page with parts (either the <title> or the snippet, but not both as I recall) of the framed page. Google's online help on this topic has always referred to method 2, but for several years when I was watching this behavior pretty closely method 1 was used almost exclusively - until last summer/autumn when the balance shifted heavily to method 1.