If you love crocheting squares and / or motifs, but you hate sewing them together afterwards, the join-as-you-go method is just what you need. With this method, you'll be joining each square or motif to your work as you crochet it.
If you're very comfortable with crocheting traditional motifs, it may take you a bit of time (and patience) to wrap your head around this way of working -- but once you get comfortable with it, you'll appreciate not having to wait until the end to join all your motifs together.
Seamless Crochet Book by Kristin Omdahl
You can find free patterns for join-as-you-go motifs here and there on the Internet; in fact, if you keep reading this list you'll find several free tutorials and patterns linked below. But if you want a whole bunch of these motifs that have already been charted out for you, including patterns for projects you can make with them, the book pictured at left, Seamless Crochet, is a worthwhile purchase.
The book's author, Kristin Omdahl, has charted out bunches of join-as-you-go crochet motifs and they are all ready for you to use any way you want to. You can use them to make the projects she has designed; projects for each motif are included in the book.
The best part: if you really want to understand how seamless crochet works, rather than just following someone else's pattern blindly, Kristin's book gives you everything you need to know. Once you understand how to do it, you can take just about any traditional crochet motif and adapt it for use with the join-as-you-go method.
This book is the most valuable resource I know of on the topic of join-as-you-go motifs. It also includes a DVD to help get you started with the technique.
Free Tutorials for Learning How to Join-As-You-Go:
This gorgeous, eye-catching shawl is crocheted using Red Heart Boutique Treasure yarn. This is an intermediate-level crochet pattern; it is posted for free at the Redheart.com website. The pattern design is by Shari White.
This colorful tutorial was written by Lucy at Attic24. Lucy demonstrates how to join bunches of small three-round granny squares.
Lucy at Attic 24 also created this tutorial, which shows you how to crochet a hexagon and then use the join-as-you-go method to add additional hexagons. Lucy admits that this pattern is a bit fiddly, and takes some concentration. If you don't mind that, the results are quite eye-catching.
See Also: Crocheting hexagons
This image gallery includes pictures showing the process of joining hexagons together using the join-as-you-go method. The link takes you to the Moonstitches blog at Typepad.