A couple of months ago I saw that the Lion Brand Yarn blog was hosting a knit-along for a top-down raglan cardigan that was already queued up in my list of to-makes, so I decided to join in. While I didn't exactly keep up with the knit-along or really customize the pattern in any way, I found it helpful to turn to the blog entries for guidance as I got to each turning point in the pattern.
The top-down raglan approach is similar to that used for the baby cardigans I have been crocheting- you start with the collar, increase the number of stitches each row at 4 strategic spots around the shoulders/armpits (creating that line of lace), then pinch the armpits together and keep knitting down the bodice until you get the length you want.
I ended up frogging (apparently knit-speak for unraveling) a crochet project I had been working on before, a tank top, after realizing it was somewhat ridiculous and I would never wear it (it helped that Colleen made fun of it when I mentioned it over Skype last fall). I used the yarn from that project (which I had purchased with a Groupon at DC's Looped Yarn Works), Berroco Comfort, for my raglan cardigan instead.