Below find the highlights of my search efforts.  There are links to free plastic canvas patterns, plastic canvas magazine subscriptions, plastic canvas books, plastic canvas kits, plastic canvas tips, plastic canvas stitch guides and even software to create your own plastic canvas patterns. 

Plastic Canvas Software 
Create plastic canvas patterns from scratch or take any BMP or JPG picture and turn it into a plastic pattern in seconds. 
Download the Demo version. 
Also:  Free Weekly Patterns 

Plastic Canvas Magazines 
Can't find your favorite plastic canvas magazine at your local newsstand?  Subscribe to the following plastic canvas magazines at this site:  PLASTIC CANVAS CORNER, PLASTIC CANVAS CRAFTS, PLASTIC CANVAS WORLD, PLASTIC CANVAS! MAGAZINE and QUICK & EASY PLASTIC CANVAS. 
(Canadian prices are listed) 

Plastic Canvas Books 
A large assortment of plastic canvas books is available at this site.  The site is well organized so if you have a something  in mind you should be able to locate it easily. 

Plastic Canvas Kits - Luvlee Designs 
Beautiful kits.  Easy to search categories. 

TGAW's Plastic Canvas Designs 
At this site you'll find the basics, free patterns (Beavis, computer, Animaniacs, Mickey Mouse and others) and links to other sites. 

Debi's Plastic Canvas Site 
Here you'll find plastic canvas tips and projects (desk accessories, holidays, frames and a few others) 

Denisse's Page 
At this site you'll find a Thanksgiving plastic canvas pattern. 

Plastic Canvas Crafts by Edith & Jim 
The hints and tips section is helpful.  There are also lots of items for sale. 

T's Place 
Here you'll find a project of the month.  There is also a helpful stitch guide that is very useful for beginners. 
If you lose your way around and can't find the stitch guide you can to directly to the Stitch Guide from here. 

Fry Designs 
Nice boutique box patterns (gumball machine, chainsaw, log cabin, grandfather clock) 

Pam's Plastic Canvas 
A variety of patterns to buy.  Variety of categories to choose from. 

PG's Designs for Plastic Canvas 
(London, Ontario) 
Featuring unique canadian designs such as provincial flag coasters. 
 
Susan's Plastic Canvas Patterns 
A few patterns available - the balloon pattern is nice.