[xiamenese]

Sorry, Joshfree ... the .doc and .docx importer works but the RTF importer is a different beast and doesn't work. If you export an RTF file containing footnotes, images etc. from another app, they won't appear in Pages, TextEdit, Bean -- the images will if you use RTFD at least in Bean and TextEdit -- or anything that relies on the Apple RTF importer without having hacked it. Scrivener and Nisus Writer (Pro) both use hacked versions of the Apple RTF importer and exporter. You can create an RTF file with footnotes in Scrivener, open it in NWP, export it to binary .doc and the footnotes will be there in Word, and therefore, I presume, in Pages.
Furthermore, the Apple RTF format doesn't recognise semantic styles, so those don't carry over into Word or Pages, either.

Edit: Oh, .doc is binary ... it is legit to create an RTF file -- they're plain text -- with the extension .doc and a changed creator-code, and they will open in Word as normal, but I don't know about Pages. OpenOffice.org and Neo-Office both read RTFs with footnotes, etc. and can save them out as binary .docs.
This doesn't help with opening an OmniOutline in Pages ... merely that unless Apple do something about their RTF file format, that's a no-go.