I knit in the round a lot—and I've twisted my cast-on a lot, too. That is, when I've cast on all the required stitches and go to join the two ends, I have accidentally let the stitches twist around the needle, even though I tried to check for that. It's really frustrating when I don't realize it until I knit a round or two. And of course, the more stitches in the cast-on, the more likely this is to happen.
A few months ago, a knitter named Dee posted her solution on the "Techniques" forum in Ravelry. I didn't see it until a few weeks ago, and I wish I had sooner! "Dee's No-Twist Circular Cast-On" is simply the best way I've heard of to prevent twisting your cast-on when you join to knit in the round. You can use it with any type of cast-on, as far as I know.
Here is a link to the original forum thread on Ravelry, where this technique is discussed at length. (If you're not a member of Ravelry, I think you'd have to join to see forums. But if you're interested in this topic, and you read blogs, and you're not a member of Ravelry... the mind boggles.)
Dee has also made a YouTube video:
Dee knitted up a strip of fabric to use, but somewhere in the thread someone suggested using a ribbon that has loops along the edge, and I latched onto that idea. There are limits to my DIY-ing. I only have so much knitting time. I'm lazy. Pick an excuse, any excuse.
I went to Jo-Ann Fabrics and found a wide, stretchy ribbon with loops AND gaps along the edges. The loops will accommodate needle sizes of perhaps U.S. 8 on down, but the gaps are stretchy and could go much bigger. It's a bright lime green that will contrast with just about any yarn I might knit.
I "hang" the ribbon either before or after the first stitch, and then every ten stitches (using it also to help me count!).
I have way too much ribbon for this project, but that's OK—it just hangs down, no big deal. I figured too much would be better than not enough. I cast on over 600 stitches for a project once, and you never know when I might do it again!
I found out the hard way that even doing this, it's still possible to twist the stitches when I join them in the round. However, it's obvious right away. I didn't have to knit a whole round before I realized it. The whole width of the ribbon twisted up and forced me to face reality.
Here's another view of the same cast-on, in case it's helpful. Another thing about my ribbon is that one side is satiny and the other side is matte, so I can tell at a glance which side I'm looking at (and therefore, whether it SHOULD be in front or in back).
I won't be surprised if this technique starts showing up in knitting reference books—it's that handy.