I've listed links below to some of my favorite sites. Check them out!

Favorite Sites
Eric Curtis' Sled Page Very nice Cat & Kaw site with lots of specs. & pictures.
Bob Lee's TNT & Blizzard Site Super site with lots of Ski-Doo pictures, specs, and messages.
Polarisman Excellent pictures, specs, even online shop manuals for most Polaris models.
Yamaha Sleds A neat page with pictures and history of Yamaha sleds.

More Favorites....
Blake Read's Sno-Jet page Blake has lots of great pictures and information for the Sno-Jet enthusiast
gbarchives Glen Mallory's web site.....nice Cat pictures and a good source of Cat information.
Brown's Arctic Cat 1974 - 2001 Cat parts manuals on-line!
vintageskidoo.com Great site with thousands of vintage sled pictures
VSCA Vintage Snowmobile Club of America.....great club, check it out
Pappillion NE Restorers A great site showing some enthusiastic sledder's projects!
Free Air Ski-Doo Doug Hakala's nice site dedicated to Free air Ski-Doos
Fireplug CDI Scott Hewelt's site, dedicated to keeping your sled sparking
1978 Camaro My son, Joe's site showcasing his yellow rocket