I finished the Argosy Shawl last night, except for the weaving of the yarn ends and blocking.  I won't have the pattern posted for a few more days but I thought I'd post a review on CotLin from KnitPicks for anyone who's interested (thanks for asking, Kate).  First off I'll explain the photos (which has nothing to do with the yarn, just with the color I used).  This is Key Lime.  The top photo was taken indoors with indirect sunlight and without a flash.  It's not true to the actual color (at least on my monitor).

This photo is.  I took it in the same location as the top one but I added a flash.  Nice and cheery bright green.  More the true color of the Key Lime peel but I guess that's all in the interpretation. 

Now what you really want to know.  This is a 70% Tanguis cotton/30% Linen blend.  Tanguis, from what I can find, is this:

A Peruvian engineer developed the Tanguis cotton; the variety bears his name. The combination of the seed, earth and the climate causes the Tanguis cotton to have a long and resistant fiber. From this variety threads are obtained for fine Polos, drill shirts, and other fabrics for trousers.

This info came from here.  Now that we know that, we can go on to how this yarn feels.  In the skein it reminds me of KnitPicks Shine, but without the slickness and, well, shine.  Its a little crunchy but not that noticeable.  Honestly, its hard to tell that there is 30% linen in it.  There are bits of Linen "shag" in the twist but in small enough wisps that it's hard to see unless you look closely.  That said, it has a smooth hand with only a slight fuzz if you zoom in on it. 

For this project, I used a #5 US needle.  My gauge is 23 sts x 28 rows = 4 inches.  It has good stitch definition and a slightly matte finish.  I haven't blocked, wet or washed it to see how it turns out.  Since I'm planning to use this shawl as a swimsuit cover-up & summer shoulder wrap (for those buildings that just don't know when to turn their air conditioners up) I'm planning to wash this many times over its lifespan.  My guess is that it'll wear well and keep its shape, keeping in mind how gravity will affect it. 

Overall, if you're wanting a yarn that will have the apparent feel of linen, this isn't it.  If you want strength and long lasting, this could be it.  And Kate, since you asked, I don't think that it will be an all-out sub for Euroflax Linen (which, if I can recall accurately, has a finer gauge).

FYI, for some reason, when I go to KnitPicks to find this yarn, its gone.  Even through a previous link, it is no longer on their site.  It's not in their new catalog either, which arrived in my mail today.  What's up with that?  Maybe it'll return.