Kat, I realise your post above was almost exactly 10 years ago:

Do any of you know the name of Pete Seeger's guitar book which someone mentioned earlier in this thread? Or any other good guitar books and/or videos? My sister has moved up from her baritone uke and the chords she's always played and wants to do more than chords on her guitar.

but did your sister find a book?
What I think was referred to earlier is the record "The Folksinger's Guitar Guide, an instruction record by Pete Seeger", Folkways FQ8354, which has a 22 page booklet inside. It is similar to the banjo book/record and I used to put it on just to listen to Pete.
I became 'the girl with the educated thumb'!! (page 5)
I don't know if Folkways have turned it into a CD but it's possible.

But your sister may be an expert by now.

Robyn