On my website I promote a boring household product that everyone needs, but no one cares about it, no one wants to read about it, but they come to Google to comparison shop for them once every couple years when they need one. I have written a few articles about the product, and yes they do have a higher click through rate compared to when I write off-topic, but the article views are dismal and NONE have been syndicated.
On the other hand, I wrote a few articles about Firefox, Mac, Windows, and some other software, and these have been widely syndicated, earning my website links all around the web.
It seems that for this particular niche, and maybe yours if you promote a product like this, all the advice around here about pre-selling, making an excellent resource box, clickthrough rates etc. don't really apply. What we really need is articles that have a super-high probably of being syndicated so that we get backlinks from all over the web for every article we write.
There are millions of websites about technology gadgets and popular computer software which will publish your article if you write on those topics. I don't even think most of them read the article or care about its quality - they're just looking for certain keywords. I haven't tried yet, but I would guess that twitter and facebook would have similar results.
So if you're mostly interested in getting backlinks as opposed to click-throughs, you might try writing on these topics.
Now my question to everyone else: What other categories besides these have you found to be regularly and widely syndicated?