eat mushrooms (or not)
I don’t know if this one is comestible, but I needed to test if the html code provided by flickr was ok with wordpress. And it seems to do the trick (not that I ever had any doubt about it, mind you).
(note that this yet again another point for/against having multiple software (or service providers) vs one True CMS. Again, to integrate pictures in my blog, on my website, I use a third-party service with a differente interface and different user account. Yes it works, but it is also cumbersome to use at first).