For some positive, non-evil mustelids in print try:
 
_Wainscott Weasel_ by Tor Seidler. Features numerous illustrations and a
heroic weasel main character.
 
_Waifs and Strays_ by Charles De Lint, the short story "Stick".  It has
a fiesty, dancing ferret as the title character's side-kick.  This short
story has been in some other collections as well.
 
Of course Native American myths and tales are often peopled by animal
characters.  A browse through those sources will get you a number of
weasel and mink stories.  I love the artwork for _Crow and Weasel_ by
Barry Lopez.
 
I read this book more than 20 years ago but if I recall rightly, the
weasel character is heroic and a great warrior against the evil forces (A
Wyrm, a Baskilisk, and legions of serpents) in _The Book of the Dun Cow_
by Walter Wangerin.
 
Links to booksellers with these books:
 
_Wainscott Weasel_:
http://search.barnesandnoble.com/booksearch/isbnInquiry.asp
?userid=2XESHQ91FR&isbn=0062059114&itm=1
 
_Waifs and Strays_:
http://www.amazon.com/exec/obidos/tg/detail/-/067003584X/
ref=pd_sim_books_2/002-2121415-5821623?v=glance&s=books
 
_Crow and Weasel_:
http://www.amazon.com/exec/obidos/tg/detail/-/0374416133/qid=1079008480/
sr=1-1/ref=sr_1_1/002-2121415-5821623?v=glance&s=books
 
_The Book of the Dun Cow_:
http://search.barnesandnoble.com/booksearch/isbnInquiry.asp
?userid=2XESHQ91FR&isbn=0060574607&itm=1
 
Enjoy!
 
-kim
 
Kimberly Burkard  |             _    Everything I needed to know in life,
                  |      _____C .._. I learned from my ferret:
                  | ____/     \___/  Frolic and dance for joy often, have
[log in to unmask] |<____/\_---\_\    no fear or worries, and enjoy life.
[Posted in FML issue 4449]