If you are looking for an easy to use binding tool, ProClick is definitely worth looking at. I've been using it in our homeschool for over a year now and couldn't be more happy with it. I'll list the pros and cons...
Pros
Spines open and close so you can continue to add to your project
The spines come in a variety of sizes, up to 100 pages
The spines can be easily cut down to work with smaller sized pages
Easy to use, even a child could use it
Pages lay flat in spines
Small, easy to store
Cons
Can only easily cut about 6-7 pages at a time and 2 pieces of card stock (for me this isn't much of an issue)
Can't bind larger pages, such as 12x12 scrapbooking pages (also not a big deal to me)
Obviously, the pros way outweigh the cons. I'm completely thrilled with my ProClick and highly recommend it!