I'm looking for a guide that provides a list of Historical roadside
stops that like this one...
http://www.saltyrain.com/steve/neworleans/new%20orleans%20sign.jpg (I
realize this one is in New Orleans).
I'm looking for a list of these that are available in Minnesota and
how to find these spots.
I would also like a list of 9/11 memorials in Minnesota.  
Thank-you.

Greetings kitch8-ga!

Here are some guides that provide information about various roadside
attractions in Minnesota.
I am also including the very limited information I could find about
9-11 memorials/ tributes in
Minnesota.

If you have any questions about the information in which I have
provided, do feel free to request a clarification of my answer. Please
be sure to allow me enough time to respond to your clarification
request before rating the answer.

Thanks so much! chellphill-ga

http://www.mnhs.org/places/other/roadside/4smaller.html#smaller
Minnesota's Larger Than Life and Other Strange Wonders

http://www.roadsideamerica.com/map/mn.html
Visits and reviews of weird sights along the highway

http://www.anybook4less.com/detail/081663632X.html
Book: Minnesota Marvels: Roadside Attractions in the Land of Lakes

http://deckernet.com/minn/mnattr.htm
Minnesota Attractions

http://www.byways.org/travel/state.html?CX_STATE=MN
Minnesota Byways

http://www.our911tribute.com/index.htm
2nd annual 9-11 tribute concert

http://www.nrotc.umn.edu/unit/public_affairs/911run/911run.html
September 11th memorial run

http://www.blakeschool.org/gifts/020109aamoth/index.html
A Response to September 11:
The Gordy Aamoth, Jr. Memorial Stadium

http://img.groundspeak.com/track/log/249592_400.jpg
Picture of the plaque on the stadium wall

http://img.groundspeak.com/track/log/249592_200.jpg
Picture of

http://www.geocaching.com/track/track_detail.asp?ID=18320
"The piece you see here is from WTC 2. This beam was a gift from NYC
to the parents of a man who was killed in the attack. (read more
information on the photos below) This is the only 9/11 memorial that I
know of here in Minnesota"
(In reference to the 911 memorial at The Blake School)

Search Terms Used:
Roadside attractions Minnesota
scenic byways Minnesota
Tourist attractions Minnesota
"9-11 memorial" Minnesota
"9-11 tribute" Minnesota
"September 11th" Minnesota

I'm amazed that you even found the 9.11 stuff on Geocaching.com...that
is the main reason I asked this question.

Here's a book you might like:

http://half.ebay.com/cat/buy/prod.cgi?cpid=2805860&meta_id=null

Similiar but more recent book:

http://www.amazon.com/exec/obidos/tg/detail/-/0873514564/qid=1059594405/sr=8-3/ref=sr_8_3/002-9159027-4456810?v=glance&s=books&n=507846